On another thread, you indicated you wanted to buy a 5 acre lot to put the RV on and live. If that's the case, I don't understand why you wouldn't just buy a small house or condo. If you decide to leave the area in 3-5 years, you can sell it. Meanwhile you have a place to live that is not going to get you in another custody battle.
It just sounds like you are putting so much time and effort into trying to make an unconventional lifestyle work for a short time frame.
Why not just be conventional until your son turns 18 and then jump into the unconventional with no barriers? At that time, you can sell the house, buy an RV and go anywhere.