To see a realtime example of fulltime RV lifestyle costs see this website:
www.rv-dreams.com
These folks have been on the road for 8 years and post their monthly expenses on the website. You'll be able to see a running tally including unexpected costs, medical, vehicle, RV problems....etc.
It's not as cheap as most people think it is.
Also, if you haven't already, listen to Dave Ramsey (financial talk show host). He has several books plus several seminars that help people overcome their financial nightmares and prepare for retirement.
Here's his website http://www.daveramsey.com/home/
