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Started by trying construction adhesive, but it reacted weird with the rubber footing of the platforms and wouldn't cure. Ended up using carriage bolts counter-sunk into the ski beds. I fashioned some 90 degree brackets from strip steel that I riveted to the platform legs and ran the carriage bolts through. It was a lengthy process since I'm not handy with these things. Took a lot of trips to the hardware store for various bits and pieces.
Not sure what Wapiti shelled out for the work platforms but I'm guessing about $40 each.