ISO used TM in Colorado

[Densvxer]

Todd & Jan from denver co area. Newbies to the forum first post.
First off this is a great forum with oodles of support.
We are interested in acquiring used TM

I noticed some TM model descriptions describing an outside shower...
Does that mean there is not an inside shower?
Or do all TM models have inside showers?

Wife & I are used to boondocking with a old Skamper popup truck camper.
Tired of setting up an outside shower booth to a tree and using a solar pack to heat up some water.
Our favorite camping spots in years passed have been down/up some semi rough roads. Typically Leadville CO areas.. Elevation ~ 10,000 ft. A standard travel trailer would be to tall for us to travel too our favorite get aways.

Looking for recommendations of models to consider purchasing and models to avoid.

Just acquired a 2006 f250 diesel with less than 130k odometer. Researching prudent bullet proofing because of known issues with these rigs.
Sold my 97 f150 gasser and truck popup camper is going up for sale soon.

Thanks for any thoughts to models that would be preferred or should be avoided.