Originally Posted by SaltyLT2012
So far it needs a fuel pump, starter and new batteries.
I can't help you with the fuel pump or starter - but batteries are a common item for all us motorhome owners.
Keep in mind you'll have two separate battery needs - on the chassis side there is a main starting battery. Large diesel pushers would probably have two. Gas powered Class A and Class C motorhome likely have just one chassis "starting" battery.
The House will have a battery bank of Deep Cycle storage batteries. Usually two in the bank but some models have 3 or 4 House batteries.
Confusing things more, House batteries can be 6v or 12v. A pair of 6v batteries will be wired in Series which create 12v. A pair of 12v batteries will be wired in Parallel making a bigger amp hour 12v bank. So, you'll want to learn about the two kind of battery wiring - Series and Parallel.
For House batteries Deep Cycle is important. You don't need CCA "cold cranking amps" like a starting battery does. You need lots of AMPS delivered over a long time, not just a few seconds starting an engine.
There is a TON to lean on this subject alone. But I suspect from your post that you are doing engine work to get the RV running and for that all you'll need is a powerful starting battery. You can worry about the house battery stuff later.