3m Paint Guard

So I've been struggling with a way to protect my hull when towing. I've put a full length mud flap on my truck and I beleive this to be one of the better things. I've thought of fabricating a rock shield on the trailer but would like to try other things less invasive.

I saw a commercial for 3m's aerosol rock guard film. I'm thinging of trying it on the front aspects of my hull. Has anyone done this before or has anyone used it on a vehicle? I'm a little concered about it not peeling off after being out in the sun all winter.

https://www.youtube.com/watch?v=1FiS...e_gdata_player