Purchase your RV keeping in mind that you just might love RVing after the 3 months around the U.S. and you'll want to do more.
We full-timed for 16 years, traveling constantly, and still didn't see the 'whole' U.S.! If you could see my paper atlas book with all the roads highlighted that we drove, you can hardly read any notation on the maps for all the highlighting. We don't do interstates. We travel the secondary roads to 'really' see the U.S. (& Canada, Yukon and up to Alaska).
Trust me.... you are not going to see the U.S. in 3 months! :)
