Hi,
What ever you do buy make sure chassis parts are available. I ran into that problem with a 1987 E-350 diesel.
Other than that watch for three things.
1. look for leaks
2. look harder for leaks
3. look even harder for leaks.
I full time in a 28'5" class C.
As far as solar goes, you need to start with an energy audit. Or simply cover all unshaded areas with solar and use a good controller that has set points for charging voltages, a battery temperature sensor, and voltage sense wires (on the battery). Buy a controller with room to grow the solar farm (unless doing the cover the roof scenario).
