It may depend somewhat where you intend to go camping/boating. If you're staying in Michigan, you can double tow a boat behind a fifth wheel (within certain restrictions and having the appropriate license endorsement), but there are a number of states where double towing is not permitted or has onerous requirements (primarily along the east and west coasts) and having a fifth wheel would require bringing a second vehicle to tow the boat trailer...or making two trips instead of one.
If you have a class C, the options are indeed to unhook the utilities to launch, or to bring another vehicle, or to find a friendly fellow camper who's willing to do it in exchange for some beer or whatever.