I have read a lot of information about the costs of full timing, both prior to actually doing it, and now after we have done it.
We don't dry camp or use state/fed parks much. Our annual average is running just under $800 a month for sites. We don't owe on anything.
If you continue to earn $70,000 plus, after going full time and not owing anything, you will be banking about $40,000 of that per year in my opinion.
We are staying in warm climates for 11 months out of the year, slowly seeing all of the U.S., and still saving over 30% of our annual income.
If I could have started doing this at 47 with my present retirement income, needless to say my bank account now would have been pretty stout.
I think you have an excellent plan! You probably will not need the much talked about "exit plan" when you reach your 60's because you will have so much money saved you could probably purchase about any property you desired.