Without any doubt, the bedliner.
It will not only protect your truck and therefore your investment, but it will also protect your cargo, preventing it from sliding all over when you are on the move, and also your hands and knees since its a more "human friendly" material than the painted metal of your truck.
At any given time, we have in stock more than 300 different bedliner models to custom fit most trucks. We can install at your office or home, give us a call at (858) 888-5338. We are Bedliner Warehouse, and we have the bedliner you need, now.