Lots of good suggestions. Thanks. Let me add a bit more clarification.
When I say part-time, I mean anywhere from 2-6 months a year, with a few short trips in between (weekends, a week, etc). We do plan on taking cross-country trips every couple of years or so, which means crossing the Rockies, otherwise just mostly in the SE and up and down the East Coast.
I still work full-time, but since we stopped full timing I found I can live with a less complete office on the road, so we are downsizing from our mid-bunk 5er to something without that kind of space. Currently at 42', looking at anywhere between 32-40.
Primarily looking for a used rig, diesel class C/super C. But all options are on the table right now, hopefully under 200K.