We run AC only refrigerator and freeze in the Class C. We can run up to 8 hours without power (just like when the house power goes off during a storm) OR they operate off the generator. to run the rooftop AC unit, we have to run the generator.
You need to read Phred's Poop sheets. Save them, print them off but KEEP THEM!!! I printed them all off. I have a 3" thick binder with all of the sheets in them (it's a lot of paper and printer ink). I also have them bookmarked and saved on the computer as well.
RV's are wired slightly differently than a house if you are wire 50amps (the neutral and ground are NOT bonded). You need to wire like an RV since you will be in campgrounds where they are wired (or supposed to be) the same way.
We use the idiot proof method when hooking into our generator. We have a 30 amp plug on the Class C. We either plug into the generator (wired in a 30 amp receptacle) OR we plug into the shore power at the campground. Hard to mess up that one.
Some folks will use standard solid Romex, others won't. I personally prefer stranded (think heavy duty extension cords... We have several left over from our construction days) but you have to tin the cut end when hooking up to electrical boxes and other connections. David (hubby) doesn't really care but we have hundreds of feet of extension cords PLUS all the stranded wire we pulled out of the Eagle (ANCOR quality stuff!)
Fred Hobe... pro converter of Coaches. good info even though mostly about his MCI. Uses 12/3 extension cords when wiring buses he converts.
RV side of life. Lots of good info.