Rentering the RV lifestyle. Questions on Bunkhouse TT's.

My ram has a solid rear window so if I go with the a cap I would need to replace the back window with a slider window.

As, for Suburban/Yukon XL's I really want to go new mainly because we try to keep vehicles for awhile and I want to start off with a new rig. My wife's current Tahoe is a 2003 that we bought new. It's still in great shape for the year but I'm thinking 1-2 more years and it's time to replace.