Car tires and trailer tires differ in design and function. While car tires are constantly turning and maneuvering during driving, trailer tires are generally rolling forward. The vehicle pulling a trailer is doing most of the work, and so are its tires. The trailer, following behind, has a smoother, straighter ride.
Because of this, car tires are highly technical, made with tread compounds that are developed for optimum cornering, handling and wet/dry braking. Trailer tires are designed to carry heavy loads.
Take a look at car tires compared to trailer tires. Trailer tires are generally smaller and narrower, with a ribbed tread pattern. Car tires are usually wider and have tread patterns with more slants, zig-zags and complicated designs. This is for the handling purposes mentioned above.
Because the main function of a trailer tire is to haul weight, it often has more rigid sidewalls and stiffer construction. Car tires offer a cushier ride to provide support for the driver and passengers. Many trailer tires are bias ply, meaning they are made of stacked layers of steel and rubber. Car tires are radials, meaning they have a curved, single layer of steel cords that stretch from sidewall to sidewall.
Aside from a flat tire or blow-out, in most cases car tires need to be replaced because the tread wears out. Trailer tires, on the other hand, are used far less frequently and usually require replacement due to age.
Boat, livestock, RV and other trailers are typically used seasonally, so not many miles get put on. After three or four years of occasional use, the trailer tires' internal components may be worn out, requiring replacement.
When storing a trailer for the winter or an extended period of time, it's important to do it properly to extend the life of the tires as long as possible. It's best to remove the entire load from the tires by putting the trailer on blocks, then releasing some air from the tires so they are not at maximum pressure. If that is impossible or impractical, get as much weight off the tires as possible. Be sure to keep tires covered to protect them from the elements.
