Does something like this floorplan work for you? It's probably the top selling bunk house floorplan.
This one is becoming more popular too:
The most capable Expeditions will not likely tow what you want. You run into a receiver limit of about 900 pounds which is under 7000 pounds loaded RV, or 6k dry. The one above is 7k dry. There are brands that offer the above floorplan from 6000-9000 pounds dry. I highly recommend planning on towing with the 1 ton. What may seem rough empty will be much more comfortable towing 7000+ pounds.
Start at an RV show to get a feel for what you like, brands, floorplans, etc. You may not find every brand and model you want, but you can compare the quality of many brands and judge most floorplans. Then you can shop. Do not buy at an RV show. I have never seen the best prices there. They tend get impulse/emotional purchases.
A & A parents of DD 2005, DS1 2007, DS2 2009
2011 Suburban 2500 6.0L 3.73 pulling 2011 Heartland North Trail 28BRS
2017 Subaru Outback 3.6R
2x 2023 Chevrolet Bolt EUV (Gray and Black Twins)