As Hellmutt stated, I do not think that paint/truck liner would offer much protection if a bike would fall or rub against the side of the trailer. As far as spray in truck liners go for trucks, I personally would spend the extra money and have the uv protection used. I have seen too many fade over time and end up looking very bad. The ones with uv protection seem to stay their color longer. For what it worth, I have had a plastic liner in my 96 work truck since new and had taken it out every spring for a wash and wax. It's the only part of the truck after 300k miles that still shines:) From what I have found, the plastic liners are nice if you are hauling large/heavy objects that have sharp edges or things that you want to be easily removed or slid from the bed- drywall,rock, gravel,mulch,manure etc. Spray in bed liners offer good protection and a less slippery surface which is nice if you are climbing in and out of your bed alot and I think look better compared to hard plastic liners. But they are susceptible to gouges/tears if a sharp, heavy item is allowed to slide across it and my only real issue with them, make removing items that I would haul, a pain to get out of the truck easily.