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can you put a car dolly on a uhal trailer

3 Answers
Roberto
12/23/25 5:36pm

No, you generally cannot and should not put a car dolly on a U-Haul trailer. This practice is explicitly prohibited by U-Haul's safety policies and is considered unsafe due to the risk of overloading the trailer's structure and creating a dangerous, unstable towing setup. The primary issue is double towing (or "triple-towing"), which involves connecting two trailing units behind your vehicle. This setup drastically increases the risk of trailer sway, complicates braking, and is illegal in most states without specific endorsements.

The main reasons this is unsafe and against policy include:

  • Gross Combined Weight Rating (GCWR): Your tow vehicle and the U-Haul trailer are designed to handle a specific maximum weight. Adding a loaded car dolly significantly exceeds this limit, straining your vehicle's engine, transmission, and brakes.
  • Tongue Weight: The trailer's hitch is not designed to support the additional downward force (tongue weight) from a dolly and a car. This can damage the trailer's frame or cause the entire assembly to fail.
  • Legal Restrictions: Most states have strict laws against double towing for non-commercial drivers. Even in states where it's permitted, it often requires a special license endorsement.

The safe and correct alternative is to use a trailer designed for vehicle transport, such as an auto transport trailer or a larger car carrier. These are engineered with the correct weight distribution and braking systems to safely haul another vehicle.

FactorU-Haul Trailer with Car Dolly (Unsafe/Not Allowed)Proper Auto Transport Trailer (Recommended)
Policy ComplianceViolates U-Haul rental agreementExpressly allowed for vehicle transport
Safety RiskVery High: Severe sway, braking issuesEngineered for stability and safety
Legal StatusIllegal in most states for standard licensesLegal with standard trailer towing laws
Weight HandlingExceeds GCWR, risks mechanical failureDesigned for specific vehicle weight
Tongue WeightOverloads trailer hitch, risk of detachmentProperly distributed and supported
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DiWyatt
12/31/25 6:25am

I looked into this when I was moving my old Civic. U-Haul's website and the guy at the counter were very clear: it's a hard no. They said the trailer isn't built to handle the extra weight and stress of a dolly. It voids the rental agreement instantly. The safe bet is to just rent a proper car trailer. It might cost a bit more, but it's not worth the risk of something breaking on the highway.

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StJames
01/07/26 6:52pm

From a mechanical standpoint, this is a terrible idea. You're creating a long, flexible lever arm that amplifies any movement. The trailer's hitch and frame are a single point of failure for an excessive load they weren't engineered to bear. The forces during braking or turning could easily cause a catastrophic separation or a loss of control. The engineering margins simply aren't there for this kind of use. Always use the right tool for the job.

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