The hitch rach will fit on the back of your camper too - you can have a hitch mounted on it. Get one that can swing out so that you can still access your rear cargo door on the truck when you need to.

There is a lady here in town who has run her roof rack into her garage WITH the bikes on it...TWICE!!! I know I think I would NEVER do that, but apparently it does happen!

I would spend the most I could afford to spend, and ask your LBS if they have any used ones available. We saved about 100.00 by buying a used one from the LBS, and got a much better rack than we had initially planned on getting. Some people trade up or get a rack for more or fewer bikes and trade their old rack in. Worth asking anyway.