Thus, two considerations must be taken into account: the physical volume of the truck trailer and the maximum weight or payload it is allowed to bear. A standard, full-size trailer measures 53 ft in length, and according to dimensions detailed in Kay (2010), has an interior height (not counting the wheels and external carriage) of between 102 and 110 in. (i.e., between 8 ft 6in. and 9ft 2in.) and an interior width of 98in. (8ft 2in.). Using the average interior height, therefore, a 53-ft trailer has a total physical volume of approximately 3823ft3. Since the nominal trailer volume can rarely be fully utilized due to the shape and size of the units comprising the truckload, we will assume that ''full'' truckloads comprise 80°/o of this total volume, and therefore we state the maximum effective volume or ''cube'' of a standard trailer to be Kcu = 3059 ft3. Kay (2010) also states the maximum payload
of a motor carrier trailer to be 50,000 lb, or 25 ton, based on U.S. Federal