Dump Trailers

Dump Trailer Sizes & Capacities

Dump trailer buyers usually shop by cubic yards and then get caught by weight. Volume and weight are different limits, and with dense material you'll hit the weight limit long before the box is full. Gravel runs about 2,700 lb per cubic yard, wet sand 2,800–3,000 lb, topsoil 2,000–2,400 lb, asphalt millings around 2,700 lb, and dry mulch only 400–800 lb. A 14,000 lb trailer holding 14 cubic yards of mulch is fine; the same box with 4 yards of wet gravel is at its limit.

The lesson: buy side extensions for light, bulky material (mulch, leaves, brush, cardboard) and buy axle capacity for dense material. Ordering 4-foot sides on a 14,000 lb trailer doesn't raise the legal load by an ounce.

How to Choose the Right Dump Trailer

Decide what you'll haul most

Demolition debris and landscape waste are volume-limited — get the bigger box and tall sides. Aggregate, soil, and millings are weight-limited — get the bigger axles and don't pay for a box you can never fill.

Pick the hoist type deliberately

This is the component that determines whether the trailer still works in year eight. Single-ram hoists are the cheapest and dump fine when loaded evenly, but they struggle with off-center loads. Scissor hoists lift far more at the start of the stroke and handle heavy, sticky material best — the preferred choice for aggregate and clay. Telescopic (multi-stage) hoists mount at the front and give the steepest dump angle, which is what you want for anything that packs, but they need a straighter, more evenly distributed load. Dual-piston direct-lift systems are simple and reliable but give the shallowest angle.

Look at the door configuration

A combo barn/spreader gate is the standard: open it fully to dump a pile, or latch it at the top to spread gravel as you drive. Double barn doors are best for loading a machine up the ramps. High-lift tailgates swing above the load for clean release with wet material.

Check the ramps

Most dump trailers include slide-in ramps so you can drive a mini excavator, walk-behind, or skid steer into the box. Confirm the ramp rating separately from the trailer rating — ramps are often the weakest link.

Confirm the power system

Look for a sealed pump box, a deep-cycle battery, a charge line from the tow vehicle, an on-board trickle charger, and a corded remote with a manual override. A dump trailer with a dead battery in a customer's driveway is a wasted day.

Body Construction, Hydraulics, and Frame

Floor gauge is the number that matters most for longevity. 10-gauge floors handle aggregate and demolition debris; 12-gauge is adequate for soil and landscape work; anything thinner will dent and eventually tear where material drops. Sides are typically 12- or 14-gauge with formed top rails and vertical side ribs — ribs prevent the belly bulge that develops on smooth-sided boxes carrying wet material.

Under the box you want an I-beam or heavy channel mainframe with a full-length subframe supporting the floor, plus crossmembers on 12"–16" centers. Watch for the rear hinge point: it takes enormous load every time the box comes up, and heavy gussets there separate the trailers that stay square from the ones that don't.

Hydraulics should be a name-brand pump with an accessible reservoir and hoses routed inside the frame rather than exposed. Cylinders on 14,000 lb trailers typically run 3.5"–4" bore. Check the fluid annually, keep the pivot pins greased, and never leave the box raised while parked on a slope — it puts side load into the hoist that it was never designed to take.

Tarps are a legal requirement in most states for loose material, and a manual crank tarp is cheap insurance against citations and cracked windshields behind you. An electric tarp on a larger trailer pays for itself in time saved.

Delivery & Buying Online

Dump trailers ship nationwide to the lower 48 with a flat-rate freight quote given before you buy. Every trailer carries our 30-day guarantee. Tell us your typical material and haul distance and we'll match the hoist type, floor gauge, and axle rating to the work.

Related Categories

If you're hauling machinery rather than material, see equipment trailers. For higher-capacity dumping behind a pickup, look at gooseneck trailers, and for containerized waste hauling compare roll off trailers. Open hauling without the hoist is covered under utility trailers, and hydraulic cylinders, pumps, and axles are stocked in trailer parts.