Do I Need a DOT Number for a Tow Truck, Dump Truck or Farm Truck?

Do I need a DOT number for a tow truck? It depends on the truck's weight rating, whether it works in interstate commerce and your state, not on the fact that it is a tow truck. Dump trucks and farm trucks go through the same questions. This page shows what the federal and state sources say, so you know what to ask FMCSA or your state agency. It is not legal advice, and rules change.

The test is the same for all three

Under 49 CFR 390.5T, a vehicle used in interstate commerce is a commercial motor vehicle when its weight rating or actual weight is 10,001 pounds or more, among other triggers. The definition names no body style. So a tow truck, a dump truck and a farm truck each ask:

1. What is the GVWR on the manufacturer's label, and the combined rating if it tows something?
2. Is any of the work interstate?
3. If it stays in one state, does that state require a number at my weight?

FMCSA says companies operating commercial vehicles in interstate commerce must register and have a USDOT number (FMCSA). Our walkthrough on who needs a USDOT number covers the general case, and box trucks have their own page.

Tow trucks

Towing adds a twist. The federal definition counts the weight of towed units and uses whichever is greater, the ratings or the actual weights. FMCSA guidance says a truck and a trailer that are each under 10,001 pounds, but whose ratings add up to more than that, are subject to the regulations. So a light wrecker may not stay under the line once it is pulling a vehicle. Ask FMCSA how that applies to your setup.

States can add their own rules for towing, separate from the USDOT number:

• Texas. The Department of Public Safety lists the markings for a tow truck as the owner or operator name, the motor carrier registration number, the city of the place of business and a phone number with area code (Texas DPS). Texas's registration chapter also says it does not apply to tow trucks as defined in the Occupations Code (Transportation Code ch. 643). Ask Texas how both apply to you.
• New Mexico. NMDOT says everyone providing compensated transportation services, including towing services, must receive operating authority from the department (NMDOT). That is state operating authority, a different thing from a USDOT number.

If another company's name is on the truck, the operating carrier's name and USDOT number follow the words "operated by" (FMCSA guidance). See tow truck door decals for the lettering.

Dump trucks

Start with the GVWR on the door-jamb label or your registration paperwork. A dump truck is judged by its rating, not by how full the bed is today.

A job can be interstate without you leaving home. The definition counts a trip between two places in a state when it is part of transportation that began or ends outside the state, so the last leg of a load shipped in from another state can qualify. Dump trailers are a separate question, covered in DOT requirements for trailers.

Dump work inside one state brings in that state's own lines, and they differ:

• Washington says intrastate commercial motor vehicles with a GVWR of 16,001 pounds or more must get a USDOT number and display it (Washington DOL).
• Nevada says you need one even if you only stay in Nevada, provided the vehicle weighs 26,001 pounds or more (Nevada DMV).
• Kentucky has a weight-distance tax license, KYU, for combined license weight above 59,999 pounds. It is a tax license, not a USDOT number, and farm-plate vehicles are exempt from it (KYTC).
• Ohio is on FMCSA's list of states that require some intrastate registrants to get a USDOT number (FMCSA). We have not verified Ohio's own weight line or marking rule, so ask the state agency that regulates trucks there.

Farm trucks

Farm trucks get partial exemptions, not a blanket one. 49 CFR 390.39 exempts a covered farm vehicle and its operator from the CDL and drug testing rules, medical exam rules, hours of service and inspection and repair rules. The list does not mention marking or USDOT registration. That does not mean every farm truck needs a number. The weight and interstate tests above still apply, and whether yours does is for FMCSA or your state to say.

Some state examples:

• Texas leaves a farm vehicle under 48,000 pounds gross weight, registered weight or rating out of its commercial motor vehicle definition (Transportation Code 548.001).
• Florida says a vehicle using its intrastate agricultural exemption at 26,001 pounds gross weight or more, or with three or more axles, must show the owner's or carrier's name and base municipality on each side of the power unit (Florida Statutes 316.302).
• Kansas Highway Patrol says a farm truck or truck tractor used above 54,000 pounds gross weight must carry lettering reading farm vehicle not for hire (KHP FAQ). Confirm the exact wording with the state.

If a number applies: the door

A covered truck needs the carrier's name and USDOT number on both sides, in letters that contrast sharply and can be read from 50 feet in daylight while stopped (49 CFR 390.21). Our display rules summary has the basics. The MC number is not part of that marking: FMCSA says no marking requirement exists for it. The Company Name + USDOT Decal puts both lines on one decal, and you order two for both doors.

What to ask FMCSA or your state

1. Does my truck's GVWR, or its combined rating when it tows, reach 10,001 pounds?
2. Does any part of my work count as interstate?
3. Does my state require a number for in-state work at my weight?
4. Do I need state operating authority or a state registration as well?
5. What marking does my state want on the door?