I left my roof white for concerns about the darker color and heat. I think it's mostly a non-issue so far in Arizona. No scientific studies, just anecdote.
Jefe, the Monstaliner needs to be rolled on to get uniform texture. They supply 3" or so plastic rollers. Buy a few of them, because the non-solids in the liner slightly dissolve the roller if you use them too long. Also, be sure to lightly sand your camper for good adhesion (obviously). I taped off my window molding and put it right over rubber moulding. Stuff sticks awesome. I imagine it would go over chrome if you sanded it enough. Sticks to plastic well too, just scuff it up.
I like the stuff for the brushy terrain because it's got great abrasion resistance. Next year I might do the entire front of the truck since the paint is hammered anyway. Holding off for a bit because I want a flatbed first.
Looking forward to your project!