If you get a little bitty guy that might work but if you get a dandy you're gonna be in trouble with that little box. I've killed several that the single racks alone wouldn't begin to fit in that box. Then I've also killed several that you could get 3 or 4 of them in that box, so like they say, "size matters".
Maybe you could do something similar to this. Just picture it on top of your camper instead of the small car.