Kundel Trench Shoring Logo - Aluminum Trench Boxes For Sale

Aluminum Trench Boxes (Trench Shields) For Sale

We offer the complete line of Kundel aluminum trench boxes for sale. Free shipping is available on most boxes. With many different options to choose from, we are certain that we have the right size aluminum shoring system for your job site. Models of aluminum trench boxes for sale include the ShoreLite, ShoreLite Lite, TuffGuy, and V-Panel. We also sell Trenshore hydraulic aluminum shoring. Standard sizes of stackable aluminum trench boxes range from 2' tall to 12' tall kits. These aluminum trench shields come in lengths up to 12' long. Trench box spreaders are available in fixed widths or with adjusters ranging from 18" to 120".

We offer four different models of aluminum trench boxes for sale.

The Kundel ShroreLite Lite is our ultra lightweight trench box. It comes in 3' tall single wall aluminum panels that are stackable up to 9' tall. The ShoreLite Lite aluminum trench box prices start at just $1,950.47

The Kundel ShoreLite is also a lightweight trench box with a 2" wall that comes in 2' tall panels. This trench box is stackable and is available as a kit up to 8' tall. The Shore Lite aluminum trench box prices start at just $1,962.96

The TuffGuy uses the same aluminum panels as the ShoreLite, however it has steel end members to give it added protection in the trench.

The Kundel V-Panel is your solution to working around crossing utilities. Each aluminum panel is 1' wide and is independently and vertically adjustable. This kit is available up to 12' tall and 12' wide.

ShoreLite Lite Aluminum Trench Box

Aluminum Trench Box: ShoreLite Lite

The ShoreLite Lite Aluminum Trench Box is built strong, light weight and modular. The panels are 3' high and stackable for deeper excavations. This aluminum trench shield and trench shoring system comes in various lengths and can easily be transported in a pickup truck. The ShoreLite are lightweight trench boxes ranging from 150 lbs. to 544 lbs. All or our trench boxes are P.E. Certified and OSHA compliant.

ShoreLite Aluminum Trench Shield

Aluminum Trench Box: ShoreLite

The ShoreLite Aluminum Trench Shield is ideal for spot repairs and as a modular trench shoring system. These panels come in 2' high stackable sections. This box can easily be assembled into a four sided trench box with the addition of corner connectors. Additionally, a leg kit can be added to get the box 2' off the bottom of the trench. The ShoreLite is a lightweight trench boxes ranging from 120 lbs. to 890 lbs assembled. All of our trench boxes are P.E. Certified and OSHA compliant.

V-Panel Aluminum Trench Box

Aluminum Trench Shoring: V-Panel

The V-Panel Aluminum Trench Shield is the star of the aluminum trench shoring industry. Kundel has the only aluminum trench shoring system with independently moveable vertical panels. This versatile trench shield can be adjusted as needed for each job and situation you encounter while working on utilities. The V-Panel trench shoring system is a must have for municipalities.

TuffGuy Aluminum Trench Box

Kundel TuffGuy Aluminum Trench Box

The TuffGuy Aluminum Trench Box is another innovation by Kundel industries. This trench shield features a patented "pin less" design. The aluminum panels for this shield slide into the steel ends. The steel ends on this aluminum box protect the panels while it is lightly dragged in the trench.

ShoreLite Lite Aluminum Trench Boxes

Note: Prices do not include spreaders. Contact us for an exact quote.

3x5 ShoreLite Lite Aluminum Trench Box
Aluminum Trench Box For Sale Size: 3x5Product: 3 x 5 ShoreLite Lite
Manufacture: Kundel
Model: ShoreLite Lite
Size: 3x5 Weight: 150 lbs.

3x6 ShoreLite Lite Aluminum Trench Box
Aluminum Trench Box For Sale Size 3x6Product: 3 x 6 ShoreLite Lite
Manufacture: Kundel
Model: ShoreLite Lite
Size: 3x6 Weight: 168 lbs.

3x7 ShoreLite Lite Aluminum Trench Box
Aluminum Trench Box For Sale; Size: 3x7Product: 3 x 7 ShoreLite Lite
Manufacture: Kundel
Model: ShoreLite Lite
Size: 3x7 Weight: 188 lbs.

6x5 ShoreLite Lite Aluminum Trench Box
Aluminum Trench Box For Sale; Size: 6x5Product: 6 x 5 ShoreLite Lite
Manufacture: Kundel
Model: ShoreLite Lite
Size: 6x5 Weight: 290 lbs.

6x6 ShoreLite Lite Aluminum Trench Box
Aluminum Trench Box For Sale; Size: 6x6 Product: 6 x 6 ShoreLite Lite
Manufacture: Kundel
Model: ShoreLite Lite
Size: 6x6 Weight: 326 lbs.

6x7 ShoreLite Lite Aluminum Trench Box
Aluminum Trench Box For Sale; Size 6x7Product: 6 x 7 ShoreLite Lite
Manufacture: Kundel
Model: ShoreLite Lite
Size: 6x7 Weight: 366 lbs.

9x5 ShoreLite Lite Aluminum Trench Box
Aluminum Trench Box For Sale; Size 9x5Product: 9 x 5 ShoreLite Lite
Manufacture: Kundel
Model: ShoreLite Lite
Size: 9x5 Weight: 430 lbs.

9x6 ShoreLite Lite Aluminum Trench Box
Aluminum Trench Box For Sale; Size 9x6Product: 9 x 6 ShoreLite Lite
Manufacture: Kundel
Model: ShoreLite Lite
Size: 9x6 Weight: 484 lbs.

9x7 ShoreLite Lite Aluminum Trench Box
9x7 Aluminum Trench Box For SaleProduct: 9 x 7 ShoreLite Lite
Manufacture: Kundel
Model: ShoreLite Lite
Size: 9x7 Weight: 544 lbs.

Financing for your trench box purchase is available through Direct Capital

Aluminum Trench Boxes by Kundel

  • Made in the U.S.A.
  • Lightweight
  • Easy to transport
  • Easy to assemble
  • Many sizes to choose from
  • Multiple spreader options
  • Leg kits available for most models
  • Wheel kits available for most models
  • Optional hydraulic spreaders
  • P.E Certified
  • OSHA Compliant
  • Cost effective solution to your shoring needs
  • Why rent when you can buy a Kundel today?
    Contact us For a Free Quote.

    ShoreLite Aluminum Trench Boxes

    Note: Prices do not include spreaders. Contact us for an exact quote.

    2x4 ShoreLite Aluminum Trench Box
    2x4 Aluminum Trench Box For Sale / Trench Shield For SaleProduct: 2 x 4 Aluminum Trench Box
    Manufacture: Kundel
    Model: ShoreLite
    Size: 2x4 Weight: 120 lbs.

    2x6 ShoreLite Aluminum Trench Box
    2x6 Aluminum Trench Box For Sale / Trench Shield For SaleProduct: 2 x 6 Aluminum Trench Box
    Manufacture: Kundel
    Model: ShoreLite
    Size: 2x6 Weight: 180 lbs.

    2x8 ShoreLite Aluminum Trench Box
    2x8 Aluminum Trench Box For Sale / Trench Shield For SaleProduct: 2 x 8 Aluminum Trench Box
    Manufacture: Kundel
    Model: ShoreLite
    Size: 2x8 Weight: 206 lbs.

    2x10 ShoreLite Aluminum Trench Box
    2x10 Aluminum Trench Box For Sale / Trench Shield For SaleProduct: 2 x 10 Aluminum Trench Box
    Manufacture: Kundel
    Model: ShoreLite
    Size: 2x10 Weight: 232 lbs.

    4x4 ShoreLite Aluminum Trench Box
    4x4 Aluminum Trench Box For Sale / Trench Shield For SaleProduct: 4 x 4 Aluminum Trench Box
    Manufacture: Kundel
    Model: ShoreLite
    Size: 4x4 Weight: 280 lbs.

    4x6 ShoreLite Aluminum Trench Box
    4x6 Aluminum Trench Box For Sale / Trench Shield For SaleProduct: 4 x 6 Aluminum Trench Box
    Manufacture: Kundel
    Model: ShoreLite
    Size: 4x6 Weight: 300 lbs.

    4x7 ShoreLite Aluminum Trench Box
    4x7 Aluminum Trench Box For Sale / Trench Shield For SaleProduct: 4 x 7 Aluminum Trench Box
    Manufacture: Kundel
    Model: ShoreLite
    Size: 4x7 Weight: 326 lbs.

    4x8 ShoreLite Aluminum Trench Box
    4x8 Aluminum Trench Box For Sale / Trench Shield For SaleProduct: 4 x 8 Aluminum Trench Box
    Manufacture: Kundel
    Model: ShoreLite
    Size: 4x8 Weight: 366 lbs.

    4x10 ShoreLite Aluminum Trench Box
    4x10 Aluminum Trench Box For Sale / Trench Shield For SaleProduct: 4 x 10 Aluminum Trench Box
    Manufacture: Kundel
    Model: ShoreLite
    Size: 4x10 Weight: 420 lbs.

    6x4 ShoreLite Aluminum Trench Box
    6x4 Aluminum Trench Box For Sale / Trench Shield For SaleProduct: 6 x 4 Aluminum Trench Box
    Manufacture: Kundel
    Model: ShoreLite
    Size: 6x4 Weight: 409 lbs.

    6x6 ShoreLite Aluminum Trench Box
    6x6 Aluminum Trench Box For Sale / Trench Shield For SaleProduct: 6 x 6 Aluminum Trench Box
    Manufacture: Kundel
    Model: ShoreLite
    Size: 6x6 Weight: 480 lbs.

    6x7 ShoreLite Aluminum Trench Box
    6x7 Aluminum Trench Box For Sale / Trench Shield For SaleProduct: 6 x 7 Aluminum Trench Box
    Manufacture: Kundel
    Model: ShoreLite
    Size: 6x7 Weight: 532 lbs.

    6x8 ShoreLite Aluminum Trench Box
    6x8 Aluminum Trench Box For Sale / Trench Shield For SaleProduct: 6 x 8 Aluminum Trench Box
    Manufacture: Kundel
    Model: ShoreLite
    Size: 6x8 Weight: 598 lbs.

    6x10 ShoreLite Aluminum Trench Box
    6x10 Aluminum Trench Box For Sale / Trench Shield For SaleProduct: 6 x 10 Aluminum Trench Box
    Manufacture: Kundel
    Model: ShoreLite
    Size: 6x10 Weight: 890 lbs.

    8x4 ShoreLite Aluminum Trench Box
    8x4 Aluminum Trench Box For Sale / Trench Shield For SaleProduct: 8 x 4 Aluminum Trench Box
    Manufacture: Kundel
    Model: ShoreLite
    Size: 8x4 Weight: 409 lbs.

    8x6 ShoreLite Aluminum Trench Box
    8x6 Aluminum Trench Box For Sale / Trench Shield For SaleProduct: 8 x 6 Aluminum Trench Box
    Manufacture: Kundel
    Model: ShoreLite
    Size: 8x6 Weight: 480 lbs.

    8x7 ShoreLite Aluminum Trench Box
    8x7 Aluminum Trench Box For Sale / Trench Shield For SaleProduct: 8 x 7 Aluminum Trench Box
    Manufacture: Kundel
    Model: ShoreLite
    Size: 8x7 Weight: 532 lbs.

    8x8 ShoreLite Aluminum Trench Box
    8x8 Aluminum Trench Box For Sale / Trench Shield For SaleProduct: 8 x 8 Aluminum Trench Box
    Manufacture: Kundel
    Model: ShoreLite
    Size: 8x8 Weight: 598 lbs.

    8x10 ShoreLite Aluminum Trench Box
    8x10 Aluminum Trench Box For Sale / Trench Shield For SaleProduct: 8 x 10 Aluminum Trench Box
    Manufacture: Kundel
    Model: ShoreLite
    Size: 8x10 Weight: 409 lbs.

    V-Panel Aluminum Trench Boxes

    Note: Prices do not include spreaders. Contact us for an exact quote.

    6x6 V-Panel Aluminum Trench Box
    Trench ShoringProduct: 6 x 6 Aluminum Trench Box
    Manufacture: Kundel
    Model: V-Panel
    Size: 6x6 Weight: 840 lbs.

    6x8 V-Panel Aluminum Trench Box
    Trench ShoringProduct: 6 x 8 Aluminum Trench Box
    Manufacture: Kundel
    Model: V-Panel
    Size: 6x8 Weight: 1118 lbs.

    6x10 V-Panel Aluminum Trench Box
    Trench ShoringProduct: 6 x 10 Aluminum Trench Box
    Manufacture: Kundel
    Model: V-Panel
    Size: 6x10 Weight: 1396 lbs.

    6x12 V-Panel Aluminum Trench Box
    Trench ShoringProduct: 6 x 12 Aluminum Trench Box
    Manufacture: Kundel
    Model: V-Panel
    Size: 6x12 Weight: 1673 lbs.

    8x6 V-Panel Aluminum Trench Box
    Trench ShoringProduct: 8 x 6 Aluminum Trench Box
    Manufacture: Kundel
    Model: V-Panel
    Size: 8x6 Weight: 1040 lbs.

    8x8 V-Panel Aluminum Trench Box
    Trench ShoringProduct: 8 x 8 Aluminum Trench Box
    Manufacture: Kundel
    Model: V-Panel
    Size: 8x8 Weight: 1332 lbs.

    8x10 V-Panel Aluminum Trench Box
    Trench ShoringProduct: 8 x 10 Aluminum Trench Box
    Manufacture: Kundel
    Model: V-Panel
    Size: 8x10 Weight: 1630 lbs.

    8x12 V-Panel Aluminum Trench Box
    Trench ShoringProduct: 8 x 12 Aluminum Trench Box
    Manufacture: Kundel
    Model: V-Panel
    Size: 8x12 Weight: 1950 lbs.

    10x6 V-Panel Aluminum Trench Box
    Trench ShoringProduct: 10 x 6 Aluminum Trench Box
    Manufacture: Kundel
    Model: V-Panel
    Size: 10x6 Weight: 1280 lbs.

    10x8 V-Panel Aluminum Trench Box
    Trench ShoringProduct: 10 x 8 Aluminum Trench Box
    Manufacture: Kundel
    Model: V-Panel
    Size: 10x8 Weight: 1703 lbs.

    10x10 V-Panel Aluminum Trench Box
    Trench ShoringProduct: 10 x 10 Aluminum Trench Box
    Manufacture: Kundel
    Model: V-Panel
    Size: 10x10 Weight: 2129 lbs.

    10x12 V-Panel Aluminum Trench Box
    Trench ShoringProduct: 10 x 12 Aluminum Trench Box
    Manufacture: Kundel
    Model: V-Panel
    Size: 10x12 Weight: 2552 lbs.

    12x6 V-Panel Aluminum Trench Box
    Trench ShoringProduct: 12 x 6 Aluminum Trench Box
    Manufacture: Kundel
    Model: V-Panel
    Size: 12x6 Weight: 1448 lbs.

    12x8 V-Panel Aluminum Trench Box
    Trench ShoringProduct: 12 x 8 Aluminum Trench Box
    Manufacture: Kundel
    Model: V-Panel
    Size: 12x8 Weight: 1927 lbs.

    12x10 V-Panel Aluminum Trench Box
    Trench ShoringProduct: 12 x 10 Aluminum Trench Box
    Manufacture: Kundel
    Model: V-Panel
    Size: 12x10 Weight: 2409 lbs.

    12x12 V-Panel Aluminum Trench Box
    Trench ShoringProduct: 12 x 12 Aluminum Trench Box
    Manufacture: Kundel
    Model: V-Panel
    Size: 12x12 Weight: 2888 lbs.

    Kundel TuffGuy Aluminum Trench Boxes

    Note: Prices do not include spreaders. Contact us for an exact quote.

    4x3 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 4 x 3 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 4x3 Weight: 520 lbs.

    4x4 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 4 x 4 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 4x4 Weight: 572 lbs.

    4x5 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 4 x 5 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 4x5 Weight: 624 lbs.

    4x6 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 4 x 6 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 4x6 Weight: 676 lbs.

    4x7 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 4 x 7 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 4x7 Weight: 728 lbs.

    4x8 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 4 x 8 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 4x8 Weight: 780 lbs.

    4x9 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 4 x 9 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 4x9 Weight: 830 lbs.

    4x10 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 4 x 10 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 4x10 Weight: 880 lbs.

    4x11 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 4 x 11 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 4x11 Weight: 932 lbs.

    4x12 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 4 x 12 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 4x12 Weight: 984 lbs.

    6x3 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 6 x 3 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 6x3 Weight: 520 lbs.

    6x4 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 6 x 4 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 6x4 Weight: 572 lbs.

    6x5 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 6 x 5 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 6x5 Weight: 624 lbs.

    6x6 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 6 x 6 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 6x6 Weight: 676 lbs.

    6x7 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 6 x 7 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 6x7 Weight: 728 lbs.

    6x8 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 6 x 8 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 6x8 Weight: 780 lbs.

    6x9 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 6 x 9 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 6x9 Weight: 830 lbs.

    6x10 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 6 x 10 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 6x10 Weight: 880 lbs.

    6x11 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 6 x 11 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 6x11 Weight: 932 lbs.

    6x12 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 6 x 12 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 6x12 Weight: 984 lbs.

    8x3 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 8 x 3 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 8x3 Weight: 520 lbs.

    8x4 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 8 x 4 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 8x4 Weight: 572 lbs.

    8x5 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 8 x 5 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 8x5 Weight: 624 lbs.

    8x6 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 8 x 6 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 8x6 Weight: 676 lbs.

    8x7 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 8 x 7 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 8x7 Weight: 728 lbs.

    8x8 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 8 x 8 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 8x8 Weight: 780 lbs.

    8x9 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 8 x 9 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 8x9 Weight: 830 lbs.

    8x10 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 8 x 10 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 8x10 Weight: 880 lbs.

    8x11 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 8 x 11 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 8x11 Weight: 932 lbs.

    8x12 TuffGuy Aluminum Trench Box
    Aluminum Trench ShoringProduct: 8 x 12 Kundel TuffGuy Box
    Manufacture: Kundel
    Model: TuffGuy
    Size: 8x12 Weight: 984 lbs.

    Trench Shoring Equipment

    Kundel TrenShore Hydraulic Aluminum Shoring Systems

    TrenShore Hydraulic Aluminum Shoring
    TrenShore shoring systems are extremely portable and easily configured to your shoring needs. These trench shoring systems are available in 2' to 12'. They can be assembled in various configurations to meet the needs of your trench shoring job.
    Tren-Shore Aluminum Hydraulic Shoring

    Free or reduced shipping is available on most boxes.

    We Ship to the following States:
    Alabama, Alaska, Arizona, Arkansas, California, Colorado, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maryland, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, South Carolina, South Dakota, Tennessee, Texas, Utah, Virginia, Washington, West Virginia, Wisconsin, Wyoming

    International Shipping is also available: Contact us for details and shipping estimates

    Choosing The Right Trench Shield

    For Laying Pipe
    A good rule of thumb is that your shield should be at least two feet longer on each end than the pipe that you are laying. The width of the spreaders should allow for a minimum of 1 foot on either side of the pipe. The height should extend 1 1/2 feet above the ground level or the dirt should be sloped 1 1/2 feet from the top of the shield. Simply put, it should be four feet longer than the pipe and two feet wider.

    For Spot Repairs and Main Line Taps
    The height should extend 18" or 1 1/2 feet above grade, or the soil should be sloped back to expose 1 1/2 feet of the shield above ground. The length should allow for two feet or more of protection for the worker on both ends. A four or three sided trench box should be used when one or more of the open ends of the trench can not be sloped enough to prevent a cave-in.