Clearance + restrictionCited official sources
RV + trailer length legal rules — US state-by-state
State laws on combined RV + trailer length. Critical for fifth-wheel + towed-vehicle setups.
Most US states set a maximum combined length for vehicle + trailer. The standard for non-commercial vehicles is 65 feet combined in most states; some states allow 70-75 feet. RV travelers towing dinghy vehicles or large trailers should verify state law before extended trips.
Frame: a general RV subject photograph — not a place on this route.
- Tier
- Clearance + restriction
- Sources
- Cited official (.gov / .org)
Practical advice
Verify with each state DOT. Don't assume your origin-state law applies in another state.
Triple-towing (motorhome + first trailer + second trailer) is allowed in some states (UT, NV, AZ, NM, MT, ID) but prohibited in others. Verify state-by-state.
What State DOT regulations doesn't tell you
State DOT regulations are individually accessible. Aggregating them is tedious. RV LIFE and similar tools maintain state-by-state references.
- FHWA federal vehicle dimensions: Federal baseline.[source]
Frequently asked questions
- Is triple-towing legal everywhere?
- No. Allowed in some Western states only. Prohibited in most Eastern states. Verify state-by-state before planning a triple-tow trip.
Authoritative sources
Verify current conditions with state DOT 511 systems before departure. RV restrictions may change. Weather may close roads.
Planning an RV trip along RV + trailer length legal rules?
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