re: wheel dollie jack

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is that 600lb rating the tongue weight?

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Yes

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How big of a boat and trailer do you think one person could move with one of those?

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If the trailer fits the boat there really shouldn't be that much tongue weight. My dad's old boat was a 19ft boat. I could easily pick it up and move it by hand.

Size of the boat would be determined by if the ground was flat and if you had it on concrete.