Long-lasting, Smooth Ride Trailer Tires - Radial trailer tires are built to have longer tread-life and a smoother ride. People who tow frequently also often report that trailers shod on radial tires tend to track better than trailers on bias-ply tires. Radial tires have steel belts running at a 90-degree angle to the center line of the tread so the sidewall flexes easier than a bias-ply tire. In addition to straighter tracking and handling, the tires run cooler. This means longer mileage and even reduced chance of blowouts. Radial tires are most common on horse trailers and campers because radial tires tend to absorb road shock and irregularities in the road surface better than bias-ply tires. This means less vibration for a smoother ride for horses and livestock, as well as less potential damage to the equipment itself. Worn tires on a trailer designed for radial tires should always be replaced with radial tires.