MI SB1437

Increases maximum length for recreational vehicles towing trailers from 65 feet to 75 feet on Michigan highways.

Allows pickup trucks with proper fifth-wheel assemblies and adequate towing capacity to tow recreational vehicle semitrailers plus an additional trailer, subject to the 75-foot total length limit.

Restricts additional trailer or semitrailer weight to not exceed the empty weight of the pickup truck or semitrailer being towed.

Requires safety chains or devices conforming to federal motor carrier safety standards for all towed vehicles, with specific attachment requirements at outer edges.

Classifies violations as civil infractions; maintains existing vehicle dimension, weight, and coupling standards for other commercial vehicle combinations.