Something to consider if you are buying a used camper... sometimes you might be able to get the hitch system from the person you are buying the camper from. I've bought two campers (the first camper came with the truck so not sure it counts) and ended up with a 48" superhitch / supertruss (yes, it was a beast to carry around, only used it once then sold the camper to my cousin and gave him the hitch). The second camper I bought the guy gave me the supertruss he had.
Don't spend money on the hitch until after you buy the camper (unless you know you are buying new and won't have the option to get the hitch as part of the deal).