Seen them at a dealer... screw to the floor just inside the door... piano type hinge and fold up inside the doorway during travel.
I was not crazy about the mounting of or the lack of easy removal if you winter and have a deck/porch entry constructed for use 4 to 5 months out of the year.
However, they are very sturdy and made of aluminum... the bottom has feet that will adjust slightly to attempt a leveling at the campsite.
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