If you want an RV you are probably better off buying an old schoolbus qnd converting.it yourself as far as price goes. There are plenty of RV parks out there that have things like power and water hookups for only a few hundred a month, the same can be had for houseboat moorings.
I do have to agree that many RVs are underpowered leading to quick engine wear, and the costs are not cheap. I see lots of RV owners since they tend to use truckstops (pilot, flying j, loves, etc frequently have RV services) and some of the most expensive ones seem far worse than the onces that were converted from old charter and schoolbuses, I don't know if it is lack of maintmence from the owners or that the buses were designed for work, and breakdown less.
I knew someone who swore by thier $20k houseboat paying like $200 a month to moor a houseboat near Seattle and that is as cheap as you could get near that city.