I am separating from the Air Force on March 15th and driving from Phoenix, AZ to Fayetteville, GA. Im looking for any type of state parks or campgrounds I can stay at, about every 600 miles or so, to save the cost of a hotel room. I have a cot and a tarp and im fine to sleep under the stars. So a couple bucks a nite to recharge is all I am looking for. Also would I40 or I20 be a better route to take?