Can I combine radial tires with bias ply (D rating) tires?

We don’t recommend doing this. A bias ply tire is a much thicker tire. If you are using a radial tire as a spare together with bias tires, it’s recommended you only travel with the radial spare for short trips (under 50 miles) until you can replace the radial tire with a bias ply tire. Using them together for long periods can cause uneven tread wear and inaccurate overall load rating. • Is there a manufacturer’s handbook that covers all makes and models of trailers? No, unfortunately. Each manufacturer has over the years changed products, changed vendors, changed manufacturing styles, and a book covering this would be larger than our store!  more