We were at Denton Ferry RV Parkon the White River 2nd week of June and a couple set up across the drive from us were in a cabin cruiser type boat. They just had a 3step folding ladder on the back to enter/exit and by the way they setup/closedup they camp in the boat often. First time I have seen this but may be more common along coast or Great Lakes area
When I was in business had a customer had a luxury houseboat on Lake O'Pines they lived full time in tied to a marina dock. This thing was huge, house AC system, beautiful boat. They just had dock rent & electric. Marina on CoE land so they didnt pay any property or school tax on this thing either.