Boat and camper tires take a real pounding on the road and long periods of storage can cause deterioration. These affordable replacement tires meet Department of Transportation Standards. Tires beginning with ST are special trailer tires with stiffer sidewalls to improve trailer stability and reduce sway. Select bias ply with galvanized, painted or chrome rims, spoked or solid, in a variety of sizes For heavier loads and/or trailers used over long distances, we recommend radial tires 6-Ply, 5 bolt pattern spoke rims