the downside to RV rental is the overwhelming cost. we looked into them, and its gonna end up being about $2000 out of pocket. now, you may get some of that back (the security deposit), but with gas already at $4 a gallon, it will probably even out in the end.
the rented tents seem weird, to me... but i guess its no different than a rented rv....
ga tents are probably where its at, though the access to bathrooms makes glenn close attractive.