I don't think you beat an Arctic Fox/Northwood short of an Airstream. They have limited floorplans and I'm not sure how available they'd be in Florida, though.
Look at some toy haulers too. The outdoor kitchen may be tough to find, but they are generally going to be heavier constructed because they're designed to carry more weight. Much larger tanks and an on-board generator would make dry camping easier if you're into that, and they're pretty flexible inside with the drop down rear bunks. You'll push it a bit with your desired length but just food for thought. The weight would be no concern with your Cummins pulling it, especially with the big hips.