Sorry to hear the TC didn't work out. You didn't want one of those small cramped things anyway...LOL
At this point you might as well try a 5'er.
Actually if you want a flat floorplan go with what you know and get another TT.
Check out Palomino River Ranch 392MB it is a single level 5th wheel floor plan.
I'm not a advocate of that unit per se, but I just want to show you single level 5th wheels are available. Let the fun begin! Good luck with whatever you decide.
Life's thrown you a curve ball, now is a chance to hit it out of the park....OK maybe a line drive single.