Maryland has a few additional restrictions on a standard semi-truck that should be taken into consideration. Maryland, like Canadian Provinces has stricter specifications on trailers between 48’ and 53’. In addition to a 41’ kingpin to center of tandems distance, Maryland inforces a 4’ maximum kingpin setback, as well as an effective rear overhang of 35% of the trailer wheelbase. Additionally, Maryland restricts the gross weight of vehicles with less than 5 axles to less than weights allowed by the bridge formula. For container movements, you can apply for a permit for containerized freight that is travelling to and from a port. When hauling a 20’ container on a 40’ container chassis, a permit is available for 90,000 lb gross weight.