Utah Code Title 41. Motor Vehicles § 41-1a-504. Exceptions to title requirements for vehicles

(1) special mobile equipment;

(2) a vehicle owned or leased by the federal government;

(3) a trailer of 750 pounds or less unladen weight and not designed, used, and maintained for hire for the transportation of property or persons; and

(4) modular and prebuilt homes conforming to the Uniform Building Code and presently regulated by the United States Department of Housing and Urban Development that are not constructed on a permanent chassis.