Here are some pics of a M1010 I just picked up as my first MV. I've followed this website a while and finally jumped in with both feet!
This M1010 has been converted to 12V (batteries are wired in parallel) but the box lights and box A/C unit still function. The fuel-fired heater doesn't do anything at the moment (haven't looked at it very closely yet), and all of the air particulate filter and other medical equipment has been removed except for the beds.
The DUVAC appears to still be on the fender and hooked up so I don't know what the wiring is up to. There is a ground disconnect in the cab so I just turn that off every time when I park it.
The truck only has 12,833 miles on it and runs great, drives OK. I drove it 100 miles home and the only issue I had was the A/C compressor clutch locking up on me. I had to cut the belt to make it the rest of the way home as I wasn't smart enough to bring any tools with me.
My only plans for right now are to fix the A/C, replace some steering/suspension/brake components and figure out exactly what kind of 12V/24V wiring I have going on. Wish me luck!