You're right, bsinmich; my bad. The hitch weight should be 20% of total loaded fiver weight.
As far as a Class C or A with toad, do remember, the OP is alone and would first have to stop somewhere on the way to the campsite and unhook the car before he backed into an RV site. And there's no reason one cannot put down the jacks on a fiver while still hooked to the truck. They are stabilizers, not lifters. And if the fiver travels level, as it should, there would be no reason to put the jacks down.
I agree that first renting a Class C would be the best way to go. And really, hooking up a trailer isn't all that difficult for a single person. I'm sure, living on a farm, watersprite has hauled quite a few farm trailers and the only thing different are the anti-sway/equalizer bars which s/he would be able to handle.