I think the main thing is not the numbers or real estate.
I did a similar thing with my wife and 9 month old girl. It is possible, for sure. I would say to make sure it suits your personality type: you and your wife can take as much time reading those signs at all the little roadside attractions and parks, you have nowhere to be. Maybe you like to plan all the details and you'll be driving 900 miles a day to get here or there. The country is pretty small traveling 75 mph. Or maybe you like to wander, taking the back roads to who-knows-where. I was always wondering if there was a legal place to camp up ahead. It's a completely different life. Also, almost everyone else works and can't hang out.
I would check out freecampsites.net and wwoof.org for keeping costs down and getting some unique experiences. WWOOFing gives you a place to stay (for free), food (partially, varies with each farm), local characters to hang out with, and something to do. Accommodations tend to be primitive, though.
You also say that you would stop traveling in a few years. Would you live in one of the units you purchased? Would you be able to pay the bills if you were living in it and you couldn't get a job right away?