We aren’t talking about the whys of how RVs get abandoned, we are talking about the mechanisms to dispose of them. I guess you could roll it down a boat ramp but that might turn into more of a problem for you. I guess you could rent a marina slot and float it there but again not going to work for many people. Maybe donate it to the local fire department for a practice drill, but then again I usually see them run away when they realize it has propane tanks and might be insured. There just seems to be no really simple, cheap or easy way to do this if you cannot donate it and it makes you wonder what they do with them! Turns out it is the same with houseboats! One suggestion I got was to abandon it in a storage facility which is what happens with a lot of old houseboats! Want an old cheap houseboat, check with a boat storage facility! I know of one that got cut up and hauled away in 55 gallon drums! I really wouldn’t want to do that with an old motorhome, last time I scrapped a car it barely covered the fuel to get it there. There was one individual that was making an AirBnb motel out of them but I haven’t heard how that worked out yet.