Re: help/questions regarding rentals
If air fares are really low for a family of 4, and keeping in mind the cost of fuel per mile traveled, as markopolo suggests, it might be cheaper to skip the section between home base and where the interesting stuff (to you) begins, where driving would be the better option to see the sights up close and personal. If you can sketch out an itinerary and decide what places you want to see or visit, you could possibly save a few bucks flying there, and starting the driving part there. Best to set up the rental first. It's possible that someplace that rents RVs might be able to set you up with a rental at your flight destination.
Family of 4 for a few weeks in an RV? I would agree, maybe a small class C would be a better size.
It's not a sprint(er) (unless you make it one), it's (hopefully) a marathon.
RV - 2018 Navion 24V + 2016 Wrangler JKU