Walk around King or Queen bed?
Wanting the bed to stay a bed? Sounds like a "separate" bedroom layout..
Pretty rare in TTs, better chance of finding that in 5th wheels or extremely long TTs (30Ft+)..
Yrs ago were were looking for a Queen (not walk around) in a separate bedroom with real wall and door.. Only found that setup in 32ft+ TTs.. Never found any "walk around" Queen beds in TTs.
As Huntingdog mentioned, gens in TTs are pretty rare, Toy hauler or 5th wheel might be your choices..
Toy Hauler, you could use the "garage" area and convert that to a Master bedroom with your walkaround King/Queen bed..
Downside to Toyhaulers is that they often have a very heavy tongue weight empty because when you put bikes/quads/golfcart in the garage the tongue would be too light and under 10% TW when loaded. So, you will need a tow vehicle with sufficient available cargo weight to handle the heavy tongue..