I had a quick look at Craigslist for Nashville. There is options for sure. With your tight schedule, and need to keep moving, IMHO you might was to go a bit shorter than full size just for the easy of getting in and out of campsites.
There is a 2001 Newmar Mountain Aire with V10 gas available. It's $34,000, and is 34 feet long. Certainly Newmars enjoy a positive niche in the market.
Getting up into build in laundry might require a bit longer, but like everything, there is a tradeoff. What would you need to tow behind? Certainly, there is diesels to do the job, but the V10 gas engine is pretty easy and quick to fix, versus having to find a CAT shop to work on your diesel.
Enjoy the search. Nice music!