I rescued my 20' from Michigan last year. I drove it back to California. It didn't give out 'till Albuquerque. I replaced the fuel pump, fuel lines and mufflers.
Then, when I got to CA, I put in a generator...it didn't have one, new Penguin AC/heater, shocks, water heater, rebuilt the carb, changed plugs and wires, beaded the gas tank and sealed it, rebuilt the power steering, dash air and heater, repainted the stripe outside and rebuilt the interior water system and sewage drain systems.
I still need to replace the furnace and flooring, and put in new curtains. These things are great projects of love. The worst thing you can do to them, is let them sit.