What are the common dump truck sizes?

By axles: single axle (2 axles), tandem (3), tri-axle (4, usually with a lift axle), quad and quint (5 and 6), super dumps with a trailing booster axle, and combinations like transfer dumps, semi end dumps, side dumps and belly dumps. More axles spread more legal weight.

How much does a dump truck weigh?

Empty weight depends on the chassis, body and options, so weigh yours on a certified scale with fuel and the driver. What's fixed is the rating: most tandem and larger dump trucks are Class 8, over 33,000 lb GVWR, and single-axle dumps often fall in Class 6 or 7.

How wide is a dump truck?

On the National Network, the federal width limit for trucks is 102 inches (8.5 feet), not counting mirrors and certain safety devices. Dump bodies are built to stay within it. There's no federal height limit; states set those.

How much can a tandem dump truck legally haul?

On the Interstate, a 3-axle tandem with about 20 feet between its first and last axles is limited to 51,000 lb gross by the Bridge Formula. Subtract the empty weight for payload. Many states allow more on state roads; check yours.

What's the biggest dump truck allowed on the road?

On the Interstate, the federal gross limit is 80,000 lb for any vehicle without a permit, which tractor-trailer dumps and transfer dumps can reach with enough axles and length. Some states allow heavier dump combinations on state roads under their own rules.

Dump truck sizes: from single axle to semi end dump, by axles and legal weight

Steve Woods · Lead Dispatcher, TruckSprint

Steve Woods leads the TruckSprint dispatch desk and reviews every guide we publish. How we research and update guides.

Updated October 2026

Quick answer

Dump trucks range from single-axle trucks (often Class 6 or 7, 19,501-33,000 lb GVWR) to tandem, tri-axle, quad and quint straight trucks and tractor-trailer dumps (Class 8, over 33,000 lb). On the Interstate, how much each can legally haul depends on its axles and spacing: about 51,000 lb gross for a typical tandem, up to 80,000 lb for longer combinations.

Source: U.S. DOE AFDC weight classes; 23 CFR 658 · checked 2026-10

When a contractor asks "what size dump truck do you have," they mean two things: how much it holds, and how much it can legally carry. This page is about the second, because that's what decides your load and your pay. Body volume is on our dump truck capacity page.

Dump truck sizes at a glance

Federal Interstate gross for EXAMPLE axle spacings (Bridge Formula, 23 CFR 658.17), not body capacity. *Two single axles at 20,000 lb each; most single-axle dumps are rated lower. States set limits off the Interstate.

Configuration	Axles	Usual weight class	Federal Interstate gross (EXAMPLE spacing)	Typical work
Single axle	2	Class 6-7	Up to 40,000 lb by axle limits; GVWR often lower	Landscaping, small sites
Tandem	3	Class 8	51,000 lb at 20 ft	General construction, aggregate
Tri-axle	4	Class 8	56,500 lb at 22 ft	Aggregate, asphalt
Quad	5	Class 8	64,500 lb at 26 ft	Heavy aggregate where states allow
Super dump	5-6 with booster	Class 8	77,000 lb at 38 ft	Long-haul aggregate
Transfer dump	Truck + trailer	Class 8	80,000 lb federal cap	Two loads per trip
Semi end, side, belly dump	Tractor + trailer	Class 8	80,000 lb federal cap	Bulk aggregate, longer runs

The gross column comes from the Bridge Formula for the example distance between the first and last axles; your truck's spacing changes it. Run yours in the Bridge Formula calculator.

Source: 23 CFR 658.17 (FHWA) · checked 2026-10

Weight classes, from the federal tables

Class	GVWR	Group

| 1 | 6,000 lb or less | Light duty | | 2 | 6,001-10,000 lb | Light duty | | 3 | 10,001-14,000 lb | Medium duty | | 4 | 14,001-16,000 lb | Medium duty | | 5 | 16,001-19,500 lb | Medium duty | | 6 | 19,501-26,000 lb | Medium duty | | 7 | 26,001-33,000 lb | Heavy duty | | 8 | 33,001 lb and over | Heavy duty |

Source: U.S. Department of Energy, Alternative Fuels Data Center: Vehicle Weight Classes and Categories · checked 2026-10

The CDL line sits at 26,001 lb GVWR, the start of Class 7. Nearly every tandem and larger dump truck needs a Class B CDL, or Class A when it pulls a trailer over 10,000 lb, and that puts the driver in DOT drug and alcohol testing.

Width, height and length

Width: the federal limit on the National Network is 102 inches (8.5 ft), excluding mirrors and certain safety devices.
Height: there's no federal height limit; states set their own, commonly 13.5 to 14.5 ft. A raised dump body is far taller, which is why you never drive with the bed up.
Length: straight-truck length limits are set by the states; combinations have federal minimums on the National Network that states must allow.

Source: 23 CFR 658.15 (FHWA) · checked 2026-10

What size means for your day

More legal weight per load means fewer trips for the same tonnage, which matters most on per-ton work. On hourly work, a contractor sizes the fleet to the job: a site with tight access may want tandems even when tri-axles would carry more. Off the Interstate, many states give dump trucks their own axle tables or grandfathered limits, so a tri-axle can be worth much more in one state than the federal figure suggests. Check your state's rules before you buy or bid.

Choosing a size for your first dump truck

Start from the work near home, not the biggest truck you can finance. Our types of dump trucks chart shows every setup side by side.

Residential and landscaping work favors single-axle and small tandem trucks that fit driveways and tight lots.
General construction and site work runs mostly on tandems and tri-axles, the most common sizes contractors call for.
Aggregate and asphalt hauling on longer runs rewards more axles, where your state allows the weight.
Long-haul bulk goes to tractor-trailer dumps, which also open freight beyond construction.

Then check three numbers before you buy: the GVWR on the door sticker, the empty weight on a scale, and the legal gross for that axle setup in your state. Payload is the gap between the last two, and it's what the work pays on.