Maybe you need to define your definition of full timing.
Is there a Walmart overlooking the Grand Tetons, or how about the Oregon Coast?
If you have to stay at a WalMart for multiple nights due to cost, then you cannot afford to full time and need to find alternate plans for your future.
We have been rv’ing for 27 years, and full time on the road for four. Camping is NOT the most expensive part of this lifestyle.
There are many other places to stay for free while traveling through an area than a Walmart.
Have yet to stay at one, and never will.
Might want to check out free and low cost camping websites, join Passport America, etc. There are hundreds, if not thousands of alternate options.
Might want to do a little more research before you head out in a couple months.