The core difference: motorized vs towed.
A food truck carries its own engine, so the road-liability and physical-damage exposure sits on the truck. A food trailer has no motor, so that exposure shifts to whatever tows it. Everything downstream of that one fact follows from it.
How a food truck is insured.
The truck needs commercial auto coverage on itself — liability for accidents on the road plus physical damage to the vehicle — layered with the rest of the stack: general liability, property and equipment, and workers’ comp if you have employees.
How a food trailer is insured.
The tow vehicle’s auto policy generally provides the liability while towing, so that vehicle must carry adequate commercial limits. The trailer itself is typically scheduled as business property or inland marine for physical damage — both on the road and while parked or stored. The kitchen build-out and equipment are insured much like a truck’s.
What’s the same for both.
General liability, property and equipment coverage, workers’ comp if you have employees, and the same event and venue requirements (limits and additional-insured status) apply whether you drive or tow.
Choosing between them — the insurance angle.
A trailer can be cheaper on the vehicle side because it isn’t a motorized auto, but only if the tow vehicle is properly insured for commercial towing and the trailer’s equipment is correctly valued. A truck is self-contained but carries its own commercial auto. Weigh that alongside cost and operating flexibility — see What Food Truck Insurance Costs and Food Truck Insurance Requirements.
The biggest insurance difference between a food truck and a food trailer is what moves it. A food truck is a self-powered commercial vehicle, so it needs its own commercial auto coverage for liability and physical damage on the road. A food trailer has no motor — it's towed — so the road liability shifts to the tow vehicle, and the trailer itself is usually insured as business property or equipment (often inland marine) rather than as an auto. That means the tow vehicle must carry adequate commercial liability, and the trailer needs physical-damage coverage both while towed and while parked. The kitchen, liability, and equipment coverages are largely the same for both, as are event and venue requirements. A trailer can be cheaper on the vehicle side because it isn't a motorized auto, but only if the tow vehicle is properly insured and the trailer's equipment is correctly valued. A truck is self-contained but carries its own commercial auto. Confirm both the unit and the tow vehicle are covered, and the choice comes down to cost and operating flexibility.