If your trailer weighs 10K lbs and you're running it down the hwy it has no business having 15 in tires on it. Change them babies for 16 in asap. Manufactors use the bare minimum to keep their costs as low as possible and to be able to keep their RV's as cheap as possible to get you to buy one. But when buying most people do not look beyond the price and appearence of the rig. If more people would go over a rig and tell them to replace the******we have to change maybe they would change....or maybe not.........