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I appreciate the comments about the trailer dolly. And in fact, I have the Harbor Freight "Bigfoot" hand truck, and it works unbelievably well - I have moved 400 pound rocks around with it, over really rough terrain. So I thought about making an attachment for Bigfoot that would let me move the trailer - but now that I'm on this kick, having a trailer jack with a wheel that will actually roll instead of digging in just seems to make sense.

Tim