So far I've got no reason to worry about it as long as you're not using the florescent colors from what I've read. Time will tell though and if things go well, the truck won't be around for me to even know... LOL But from what I've read from people in places like Texas, Az. and here there doesn't seem to be any fading issues. Seems like the biggest concern is in the hot climates you get out beyond about 2.5-3 years it can get difficult to peel off due to being brittle. It'll still come off but it comes off in smaller pieces making it harder rather then just peeling in like one solid panel piece.
Again though, that's all from what I read. My only first hand is the spray I did on the beadlock rings.
If anything, go grab a can and paint the fenders on your trailer or something similar like this week and get the testing going... It'll cost you like $8 and would be a good test to see how it works. Make sure you do at least 4 coats, the more the better for peeling it off down the road.