The only issues I have ever heard about full covers are:
a) Get one that can breathe so that moisture isn't trapped underneath it creating a mildewy/rusty mess
b) get one that has a soft underbelly so it doesn't abrade your paint off.
06 Rubi with some sort of double ended, chrome knobbed, cross threaded, infinitely adjustable, frequently breakable, worn out flammywhammers zip tied onto it.
It used to be a jeep thing... til that sh!t broke!