Car-Topping Club Boats
USRowing Trailer Laws website: http://www.usrowing.org/trailer-laws/
§ 4924. Limitations on length of projecting loads.
(a) General rule.--Subject to the provisions of this subchapter limiting the length of vehicles and loads, the load upon any vehicle or the load upon the front vehicle of a combination of vehicles shall not extend more than three feet beyond the foremost part of the vehicle, and the load upon any vehicle operated alone or the load, other than a nondivisible load, upon the rear vehicle of a combination shall not extend more than six feet beyond the rear of the bed or body of such vehicle.