IT is FREE! It is old and shot. Use "get rot" Liquid nails, etrnabond tape, dicor and some new wood, spliced in. Cobble it together as best you can.
Use it enjoy it, end of the day it is not worth much. Forget about the AC's, throw a battery in it, figure out the lights. Water heater is probably a cheap fix, burned out element. Front end make it safe. Replace the tires as they are probably old and dangerous.
End of the day for maybe 1500 to 2k you can make it safe and serviceable. You would be hard pressed to justify spending more on it.
Look at the NADA value on it, And DO NOT add in options, retail is 3 to 4k. private party value maybe 2K to 2500. As I said cobble it together, make it safe, use it enjoy it. But don't go blowing money on it as you will never get it back out