Spartan,
Let me make some points here that have not been touched.
This is your first RV and your are from Michigan. Michigan is a relatively populated state when compared to some of those west of us.
You don't say where you are going and what you plan to do. That may be because you don't even know yet. (That is good.)
That all be the case, a generator, be it onboard (ours is) or a carry out, will add a measure of flexibility to your travel when the carefully laid plans fall apart (that is usually the third day).
When you look at your incremental cost, it is (IMHO) a nolo contendre. If the coach has a microwave, it takes a lot of battery to run those. A/C is impossible.
So, unless you are going to map your travel in 200 mile days from FHU to FHU, I would advise getting a generator.
Matt