Many have done just what you have posted. Some stay on the road and within a couple of years sell the houses others stay on the road for a couple of years and go back to the live in the house. It's really a life choice based upon what happens and how you feel after being on the road for a period of time.
Here's a good website with lots of information from a couple that have been on the road almost 10 years but originally thought they would last about 5 years.
www.rv-dreams.com
They post their monthly expenses so you can see what their costs have been since they began. Look through the journal entries for answers you may have.