It is unfortunate but true the responsibility falls on the buyer when buying a unit like this… as you pointed out they stressed it is as is, so made no false representations…
Buying something like that should have been taken to a qualified shop for a professional inspection by a disinterested party… if that had happen you would be out a couple hundred bucks maybe but walked away from a bad investment…
A lot of people own RV’s for a long time but wouldn’t be qualified to do a thorough inspection like the one that was needed on the MH…
It is what it is… a as is purchase… sorry you had to learn this in such a harsh way…