Pusrchase on West Coast or Florida for cross country trip.

I'd say not wise to buy an older unit essentially blind, away from home.
You're exuding your lack of knowledge of vehicles if this seems like a good idea.
Better to have ahead of time and repair any issues prior to embarking.
Of you're extremely handy and not fazed by keeping up with potential issues, while on the road.
Good luck in your search.