You really need to watch the weight on this one. Underneath the coach is a G30 van which has a GVWR as low as 8600lbs. This bus could well be that low, as it has the 350 and not the 454 motor.
That's not really enough to support an insulated build with very much wood, water, batteries, solar and a decent fridge. The bus probably weighs over 3 tons empty. A full, comfy build would be so close to the GVWR empty that loading it with people, gear and tools might very well put you over, and would rule out towing much of anything.
Also, the 4L80E trans and optional ABS (if so equipped) were first-year systems in 1992 and were a little troublesome compared to those from about 1996 on. Solenoids on the transmission, sensors on the brakes. Both were improved over time. The ABS was primitive, too, but works well enough. It should still have the original L05 motor, which is a winner and will go 200k+ on clean oil and coolant, and can be upgraded 100 different ways cheaply. That's the last original (Gen I) Chevy V8 in there, dating back to Ed Cole's design for 1955. Expect it to leak from the oil pan and rear seal once you start driving it, though. This is normal, and is OK generally up to your personal point of intolerance for it. Probably need a new radiator shortly, too. Don't ask me how I know...
At $9k it is overpriced, but a perfect rust-free low mile bus with new tires, battery and full service history might be worth over $5k to the right guy. The big problem is the (probably) low GVWR...