There is a strong possibility you will change your mind many times in four years. It was a good suggestion to rent a couple units along the way to try to visualize life "on the road." There is very little privacy in an RV, your neighbors are closer than your spare bathroom is right now, you won't have a workshop anymore to clean on Saturday and you don't have a yard in which to keep a trampoline.
All reasons why we stay on the road nine months out of the year!