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As EJ rightly pointed out, it's not the size of the tow vehicle's engine that determines tow capacity. It's vehicle weight and the running gear; suspension and specifically the brakes, that make a tow vehicle worthy or not. As long as the boat and tow vehicle do not exceed the Gross Combined Weight Rating (weight of tow vehicle plus anything towed), not to be confused with Gross Vehicle Weight Rating, which excludes any trailers. However, the trailer's tongue weight is to be included in the GVWR, just like any cargo.