Just noticed this thread today even though it is several months old and I have to say I feel genuinely sorry for the OP, the RV in this condition has no value so fixing it is the only option.
I speculate (no more and no less) that the previous owner noticed something suspicious and decided to get rid of it before it's to late. I have seen people abusing their vehicles and RV's like no one would believe, that's why I'm very careful buying used.
2013 RAM 3500 Dually Longhorn
2014 Trilogy 3650RL, W/D, Onan 5500, 8000# Axles, IS, 960 Watt Solar, 6x6 Volt Battery Bank, Freedom SW 3012 Inv/Charger