Above, we're unloading the scooters in San Francisco. My original thought was to use three skids and strap the scooters to them and then strap them in place, but my father-in-law had a far superior idea.
He suggested that we buy a star wrench (like an allen wrench) and remove the screws from the floor and replace them with eye hooks, washers, a lock washer, and a nut -- all of which is a hair smaller than the threaded hole in the frame of the truck. It was so easy.
My father-in-law also built rear wheel chucks out of the scrap 2x4s from Home Depot. The idea being that there would be no forward/side movement of the rear end. We strapped down the scooters using Canyon Dancers around all three handle bars (my preferred method). This method worked very well.
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