Feel around the inside walls and ceiling for any soft spots, peeling wall paper, etc. That could indicate water damage. Water damage isn't necessarily a deal breaker especially in such an old unit. I had some in my 85 Pace arrow, but if your handy, it's not hard to fix. Just so long as the damage isn't extensive. If the wall seems soft and the floor around it does too, I'd probably pass. Replacing the flooring can get complex and expensive especially if cabinets or walls have to be removed. Check for old water damage or leaks (wood turns black around leaks). I'd try and go back in a day it's raining, or shortly after its rained to see if you can find any wetness. Especially inside around roof vents, A/C's, light fixtures, or any other areas where holes were drilled into the roof and later sealed (I.e. antennas, roof racks, ladders etc).
Be prepared to reseal the roof if you decide to get it. It's something i would do to prevent expensive repairs in the future, especially if the old caulk is old and peeling/ cracking. Btw, Fleetwood used a fiberglass roof. Not a dig deal to seal, but I'd wear coveralls when up there as you will get fiberglass all over you and it itches like crazy if you lean yourself on the roof and touch it with your skin XD.
Good luck bro
