Well catmandude, thank you for your service and wish you the best possible outcome finding a RV.
If it's not going to be moved, I might suggest finding a travel trailer, something that's "4 season rated". Doesn't mean it's bulletproof from the cold but in general should be a better starting point and a trailer would be much easier to skirt around and insulate underneath than a Ckass A. And much cheaper for the space you get apples to apples compared to a CL A. Trailer with no slides would be in general warmer than with slides especially with slides out.
Power/propane usage aside, aside from the coldest month or 2 I don't believe it would be that hard to keep it thawed and have water. Either way you'll have to do some work and stay on top of the issues as they arrise.