We have been full timing for 2 years. We are in our 50's and have no regular income. We work camp. We have spent a summer in yellowstone a winter in So.Cal. and Arizona and a summer in Idaho. Summer is easy to find jobs that pay for all hours and a free site. Winter is a bit tougher. We are getting ready to head to Sadona Az. to volunteer at a state park for a site.
If you watch your expensives and don't be foolish it is very doable. We enjoy the out doors and spend our time enjoying the area we are in. We don't go and spend our money on things we do not need. We do this to enjoy different places. Travel is expensive if you stay in one place for a season (Yellowstone 6 mounths) it is cheaper than living in S&B. Get a plan and a budget and stick to it. This is an awesome live style we have seen so many wonderful places and met some great people.
Good luck