I race sports cars and I doubt all the out of towners I see at the tracks got a permit for their towing.
However, here's a link and what I think is the pertinent section. As long as the overall is less than 65ft you shouldn't have a problem.
(a) Straight trucks.--No straight truck may exceed a length of 40 feet in extreme overall dimension, exclusive of safety and energy conservation devices approved by the department for use on vehicles using public roads. A straight truck may tow no more than one trailer, and such trailer may not exceed a length of 28 feet. However, such trailer limitation does not apply if the overall length of the truck-trailer combination is 65 feet or less, including the load thereon. Notwithstanding any other provisions of this section, a truck-trailer combination engaged in the transportation of boats, or boat trailers whose design dictates a front-to-rear stacking method shall not exceed the length limitations of this paragraph exclusive of the load; however, the load may extend up to an additional 6 feet beyond the rear of the trailer.