I’m assuming someone has already mentioned this to you, but if not I would humbly suggest:
Keep the RV and get three friends to go in with you on an old Cub to putt around in for a few years. Six grand a person will get you a perfectly flyable Cub. $50/mo to insure.
A&P friends will come out of the woodwork to help you with it. “Pay me? I’ll work on it for free if you’ll let me fly it occasionally!”
Having access to both an amazingly fast cross country RV and a low and slow J3C really lets you appreciate both designs’ strengths. I used to think there could be a perfect, meets most of your goals, aircraft. I later figured out that this mythical ‘one’ aircraft is an RV with a 65hp J3C parked next to it <g>.
Best case, you keep the Cub forever. Worse case you sell your share after a couple of years of fun.
It’s hard to get a picture like the one below in an RV….taken last year by yours truly.
As Stein says….my .02.