Refrigerators that are typically found in RVs that run on propane or A/c are expensive and small. The fridge in our 5th wheel is one such fridge and it has recently quit on us. It's the most common size for most campers at 8 cubic feet of inside space. That little jewel is $1500 to replace! We are going a different route on replacing it that I think you should at least consider for your bus
@Trevor Shipman . We're putting in a residential type and we'll be gaining 2 cubic feet right away. We'll put in an inverter to power it as we're traveling hooked up to our single deep cycle battery. We don't boondock, but if we wanted to start we would add a second battery and a solar panel or 2. The propane powered fridges are the main cause of rv fires and are not as efficient at cooling as there residential cousins. Majority of the current TV manufacturers going this route because of those 2 reasons. Most class A coachs are ALL electric which means no propane at all.
Trevor I'm thinking you're gonna want a generator powerful enough to run at least one ac unit as you're traveling to keep the bus as comfortable as possible. Being in N. Carolina I know it's hot and humid all summer long so you'll certainly want it cool to keep momma happy. To keep things simple and as seamless as possible I'd stick with a diesel generator so you only have one type of fuel onboard. It will cost more up front, but it will last a lot longer and run more efficiently under load.
If you want to do most of the work yourself I'd buy a welder and and start learning. Or another route is take some courses at the local trade school or community college to learn the basics if you don't have a friend to show you the ropes.