On the toyhauler, yes there are a few, Thor outlaw, and Newmar Canyon Star comes to mind, but I was referring to a 5th wheel TH, the garage areas in many have drop down bunks. That would also provide a "play area" when your toy was outside. Some even have permanent bunks above the garage leaving it free as a workspace.
If you are looking at Motorhomes because you are hoping it will be easier to heat, Texas had a very bad winter spell, I doubt you would find a MH much easier to heat, the front glass areas are a loser compared to an insulated front on a 5er, and the wall construction isnt going to be much if any thicker. You may have an easier time finding double pane windows, but those would be available in the 5er too.