Re: generic generator question
If your RV does not have a load control center, then you should never try to supply power to your RV with BOTH the generator AND the shore power connected at the same time. (I thought most RV manufacturers had found a way to not allow this by now. Usually there's a switch to supply power from one or the other, but not both.)
I said "supply power", because, yes, if you throw the breakers off at the generator it won't be supplying power to the RV, and you could run it to "exercise" it.
The reason you don't want both connected together is that your generator is not synchronized to the shore power frequency or amplitude. They may be close, but not in sync. They will be alternately supplying and loading each other; a very bad situation.
@Nedra - A 2000 KVA generator would probably be the minimum size for your load, but that wouldn't allow you any access when the A/C was starting. A 3000 KVA would provide you with some spare power.