Well, I finally got around to building a rack on casters, inspired by @Carp 's design. It's a bit ugly but all the lumber and the pipes were random materials I already had in the garage. The gap between the middle and top rows looks excessive, but allows you to flip the middle boat over for easier loading onto shoulders (plus I had to lower it an extra 2 inches to avoid a giant knot where I was going to drill the hole for the pipe). Still work to do on organizing the garage, but now I've got a little more breathing room.
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