Originally Posted by bikenskijerm
I'm almost 100% sure that the rating assumes a full tank of fuel and stock ballast being full as well. In this instance you'd only be counting 1500 pounds of weight.
I'm almost 100% sure you are mistaken (no offense). Many capacities listed dont even assume the motor.
However, federal law only requires boats under 20' to have a capacity plate, and it is up to each state to decide whether or not to enforce the capacities. In many states it is only a guideline, not an enforceable regulation.