I have three main flatbed trailers. All bumper pull. One has two 3500 pound axles and 15 inch tires. One has two 7,000 axles and 16 inch tires and the other has three 7,000 axles with 16 inch tires. I always run metal valve stems and have run the heaviest ply Kumho truck tires I can buy and have had zero tire issues. I normally run fairly heavy and run right down the road. I do keep my trailers in a shed.