Hi and welcome. You found a great place to learn
My hubby is 6' and has no problem inside our '08 Safari (except a poorly placed light fixture in the shower). I believe the twin beds are longer than the queen, so that might be a better option. I am sure someone else will chime in on the interior heights of vintage units.
Colonial Airstream Colonial Airstream - Airstream's #1 Volume Airstream Dealership, New Jersey, RV, Travel Trailers, Motor Homes
is about 5 hours east of you. They have a lot of Airstreams on hand so you can walk around in them, try the various features on for size, etc. Since you enjoy driving, consider a visit
Though I never drove a truck professionally, besides loving my Airstream, I LOVE to drive my new heavy duty diesel truck! What a blast!
What do you have for towing with? That will help determine what is possible. If you don't have a TV yet, consider waiting 'till you pick your unit to get one (or go HD like I did!), so you won't be in a bind later.
Enjoy the journey, keep reading, and get inside some when you can.