Has anyone checked the accuracy of his no-more-than-3-feet statement?
Found this regarding "extremities" in the California Vehicle Code. It sounds forgiving enough, as long as you stick a flag on it.
TO THE REAR:
Per CVC
Section 35410, the load upon a vehicle, trailer or semitrailer shall not extend to the rear beyond the last point of support for a greater distance than that equal to
two-thirds of the length of the wheelbase. The wheelbase of a semitrailer shall be considered as the distance between the rearmost axle of the towing vehicle and the rearmost axle of the semitrailer.
MAXIMUM LENGTH FOR VEHICLE AND LOAD:
Per CVC
Section 35411, the load upon any combination of vehicles shall not exceed
75 feet measured from the front extremity of the front vehicle or load to the rear extremity of the last vehicle or load. The load upon a STAA vehicle, when the overall length of the combination of vehicles exceeds 75 feet, shall be confined within the exterior dimensions of the vehicles. For the definition of a STAA vehicle, see the green truck dimensions at:
Truck Map Legend (PDF) .