What are your electrical usage habits?
For things like lights, charging phones, water pump, that's all battery. If you want to get into entertainment like TV, radios and anything that needs 120v, an inverter is much cheaper and way less noisy than a couple generators! You must have a good way to charge your batteries, and I'm not sure the vehicle is a good way. Takes a long time - but then again, if your usage is very light, no matter.
I've been around people using a gen to watch TV, but it's kinda annoying because it drones on for hours, and I know that's what they're doing. I've dry camped a lot in all kinds of situations, and I very rarely see people running air from their gens.