revrick3, as you probably know, there are tons of threads here talking about exactly what you want to do so you will have a lot of reading to do.
If you are going to boondock, solar is certainly a plus to keep the batteries topped off. Even more solar and you may not have to run the genny very often.
If you are trying to budget, a lot of people will 'work-camp' to defray costs. The thread on work camping is interesting to read. Some people work for Amazon at Christmas time to earn a few extra bucks to keep traveling all year.
As far as fuel usage on the coach, I personally, didn't want propane on board. I just wanted to buy one fuel (diesel). Our previous coach and the new one are all electric which works well for us. Our type of camping may dictate a different set-up which is fine, everyone is different and there are 1,000's of set-ups that will cater to your needs.
I feel having a regular tow vehicle is best. If you don't start with one, I think you will have one eventually. It just makes sense, especially, if you break down you can drive for parts, etc.
We even used our tow vehicle to give our coach a slight push (car connected to the tow bar) out of a slippery RV spot. We were in Tea, SD, and our site was higher in the front than the rear. It had rained the night before and our 40,000 lb. coach (previous coach) sunk during the night.
When I started the coach and put it in drive, I could roll about three feet and the drive wheels would start spinning. I did that 3 or 4 times. Then, I got the bright idea for my co-pilot to jump in the Honda and hit the gas as I try and pull forward. It worked, the little Honda gave us a enough momentum to overcome the mud slick. LOL!
A dingy vehicle is so handy. If you really want something small, a Honda Fit (manual) or Smart car are nice.
Good luck,
MM.
Mr.Mark
2021.5 Pleasure Way Plateau FL Class-B on the Sprinter Chassis
2018 Mini Cooper Hardtop Coupe, 2 dr., 6-speed manual
(SOLD) 2015 Prevost Liberty Coach, 45 ft, 500 hp Volvo
(SOLD) 2008 Monaco Dynasty, 42 ft, 425 hp Cummins