What do you think your truck is? Sure as hell qualifies for the term classic since it's more than 25 years old.
But then again our family vacations as a kid were loading up the Nomad and heading out for a week or two. Denver to Indy was the longest one we did. The car wasn't a classic by the 25 year definition then (it was '78 for that trip) but it sure wasn't new. Dad carried a small tool box, spare points, condenser and brushes for the generator. Which he had to change out the generator brushes somewhere along the way.
Roadtripping as you've done you know the truck is capable. Its not much further to get to Moab..