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drill some holes in the bottom of the legs and mount a chunk of wood or metal to it with some bolts and find the style casters that will work for your purpose and mount those to the wood or metal you mounted to the legs....the metal or wood will help the overall strength of the lower legs when transporting over rough or uneven surfaces
I haven't but would be interested in seeing anything that someone comes up with!
The lower legs on the WSM are really not sturdy enough to support wheels, so not sure even a chunk of wood can help. I was thinking more of a fabricated cart that would support the bottom section...