End Dump vs Side Dump vs Belly Dump Trailers

End dump, side dump and belly dump trailers all haul bulk material behind a tractor, but they unload in very different ways. That changes what each one hauls best and where it can safely dump. This guide compares the three on how they work, what they carry and what they cost to run.

To see how many loads a job takes with each trailer’s capacity, use the dump truck loads calculator and pick End dump, Side dump or Belly dump.

How each one unloads

End dump. The box tips up at the front and material slides out the back through a tailgate.

Side dump. The tub tips to one side and dumps material in a row alongside the trailer.

Belly dump (bottom dump). Gates underneath the trailer open and the material drops out while the truck moves forward slowly, leaving it in a row (a windrow).

What each hauls best

These are general points. Check them with dealers and experienced operators in your area.

• End dump. A general-purpose hauler for many bulk materials, including larger rock and demolition debris, and useful when the material needs to go in one pile.
• Side dump. Useful where material is spread along a line, and for material that may stick in a box.
• Belly dump. Suited to free-flowing materials like sand, gravel and aggregate base that need to be laid in a row, for example on road building.

Site conditions

How and where you can dump matters as much as what you haul.

• End dumps raise the box high to dump, so the ground needs to be firm and level, and there must be room overhead (watch for power lines).
• Side dumps dump without raising a box high overhead, but need clear room on the dumping side.
• Belly dumps dump while moving and need a clear path, and generally can’t place material in a pile or in a hole.

Tipping trailers can be unstable on soft or uneven ground. Always follow the manufacturer’s instructions and your site’s safety rules.

Capacity

This site uses these typical ranges. Payload depends on the tractor, the trailer, axle spacing and state weight rules, so check your own registration and state limits.

Trailer	Payload (typical)	Bed volume (typical)
End dump	22–25 tons	18–25 yd³
Side dump	22–25 tons	20–30 yd³
Belly dump	22–25 tons	18–25 yd³

The side dump bed volume comes from a published source. The other ranges are this site’s typical examples and have not been checked against a published source yet.

The federal gross vehicle weight limit on Interstate highways is generally 80,000 lb, and bridge formulas and state rules can be stricter. The whole rig, tractor and trailer, counts toward that limit.

Because payload is similar for all three, the difference in loads usually comes from bed volume with lighter materials. The loads calculator checks both weight and volume for your job.

Cost per hour comparison

At this site’s example costs (the same truck payment, insurance, permits, driver wage and 160 billable hours a month for each, with diesel at $5.35/gal):

All three come out the same because this site uses the same typical fuel, maintenance and tire estimates for them. Real trailers differ in purchase price, maintenance and how much of the year they work, so use your own quotes.

Put your own numbers into the cost per hour calculator for each option, then set a rate with the hourly rate calculator.

Choosing between them

1. Start from the work. List the materials you’ll haul and how customers want them placed: in a pile, spread in a row, or laid on a road.
2. Look at the sites. Soft ground, overhead lines and tight spaces rule some trailers out.
3. Check your state’s rules for the rig you’re considering.
4. Price it. Get real quotes for the trailer and insurance, and run them through the cost per hour calculator.
5. Talk to people who run them. Experienced operators and dealers in your area know which trailers local customers ask for.

Each trailer has its own page with capacity and costs: end dump, side dump and belly dump.