I wish I were a metal worker - never learned though. Have you seen those over the door hangers and towel rods that fit on kitchen cabinets? If one of those could be made that were oversized enough to go over a running board, and just hang like a stirrup it would be great.
Amazon.com - InterDesign Marcel Over the Cabinet Towel Bar, Bronze - Paper Towel Holder
It could be bent out of one piece of rebar perhaps
I'm getting used to the higher step, but when the ground is uneven and I get out and it's 4 inches lower than I'm expecting - oof. Getting back up IS a strain. Guess I'll get a another folding footstool and add a rope to pull it in, or maybe a pair of platform sandals and use the left one to raise myself up, then kick it off once I'm in the truck.
Necessity IS the mother of invention