What are the maximum legal load sizes of a shipment before it’s classified as oversize or over weight?

Maximum legal dimensions/weights.

Google maximum dimensions

Maximum dimensions and weights for transport.

  • Length: Combined overall is 65 feet or 19.812 meters.
  • Trailer length: 48 feet or 14.6304 meters. Some 53 feet or 16.1544 meters.
  • Width: 8 feet and 6 inches or 2.5908 meters.
  • Height: 13 feet and 6 inches or 4.1148 meters*.
  • Weight: Combined overall is 80,000 pounds or 36287.39 kilograms.
  • Shipment weight: 47,000 pounds or 21318.841 kilograms at most.

*Note: For US states maximum height varies. East of Missouri river is 13 feet and 6 inches or 4.1148 meters and west of the Missouri river is 14 feet or 4.2672 meters. Alaska maximum height is 15 feet or 4.572 meters. This is only a rule of thumb and not exact. For example Oklahoma is 13′ 6″ or Colorado and Nebraska are 14′ 6″. Also some designated routes are approved for additional heights. Be sure to research any/all laws before attempting to ship oversize or heavy items. Shipping it legally can be tricky.

Google maximum weights

Maximum weight restrictions for trucking.

Learn more about oversize trucking and transport.

Each state or province has different regulations. The above is a North American average. Regulations for heavy haul and oversize trucking can be very complex once a shipment has been determined “heavy” or “oversize” and there is a classification system within each state that can even qualify a shipment as a “super load”. Once dimensions or weights exceed the legal maximums transport permits are required. Some shipments may require pilot cars or even pilot cars equipped with height poles or the trucking company may be required to have a route survey performed. It’s important to consult a professional before attempting to transport any objects, machinery or equipment that is oversize or over weight.


Know the legal limits anytime you transport a load.

Whether you are a professional truck driver or a novice with a pick up truck it’s always smart to know the laws. Public safety a big factor to consider when transporting large or heavy items. Public property should also be factored in as damages could crush you financially. Fines and possibly getting your vehicle towed and impounded are other factors to consider. Always consult a professional as well as local laws when considering transporting over dimensional or over weight shipments.



  1. Request quote to transport over-size (29’L x 12.5’W x 11.5’H), over-weight (53,000 lbs.), permit-required USAF hypobaric chamber from Tyndall AFB, Panama City, FL 32403 to JBSA Lackland, TX 78236 in the May/June 2020 timeframe. Adsync will arrange for craning chamber on to and off of lowboy trailer at origin and destination.

    • Sorry Michael but you must post your oversize and heavy haul freight by clicking on “quotes”.

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