GTWR

AcronymDefinition
GTWRGross Trailer Weight Rating
GTWRGrand Trunk Western Railroad
References in periodicals archive ?
The GCVWR is often less than the truck's gross vehicle weight rating (GVWR) added to the trailer's GTWR. A pickup with a 9,600-pound GVWR (be sure to check tire capacities, too) hitched to a trailer with a 12,000-pound GTWR probably won't have a 21,600-pound GCVWR--more like 18,000 pounds, depending on the truck and its equipment.
These heavy-duty hitches are often rated for 25,000 pounds GTWR or more (most pickups can't legally or safely tow that weight), and when located ahead of the truck's rear axle, they proportion the load to the front axle.
Higher GTWR trailers are often equipped with electric brakes, electrically actuated hydraulic brakes+ or surge actuated hydraulic brakes.
Each trailer's GTWR is based on an evenly distributed, idealized, maximal payload, which is easy to achieve with grain in a dump trailer, but not so easy with sheep in a livestock trailer.
This is particularly critical for tagalong trailers since goosenecks and fifth wheels are designed with an unladen tongue weight approaching 10 percent of the GTWR. Moving freight forward increases the tongue weight, while moving it behind the rear trailer axle can cause a negative tongue weight and overload the axle.
* GTWR (Gross Towed Weight Rating)--The combined weight of the trailer and cargo.
This is particularly critical for tagalong trailers since goosenecks and fifth-wheels are designed with an unladen tongue weight approaching 10 percent of the GTWR. Moving freight forward increases the tongue weight, while moving it behind the rear trailer axle can cause a negative tongue weight and overload the axle.
Table 1 Society of Automotive Engineers Trailer Hitch Classes SAE J684 Hitch GTWR Ball Bolt Diameter * Max * Class (pounds) Diameter * (inches) Tongue (inches) Weight I 2,000 1-7/8 3/4 200 1-7/8 1 II 3,500 2 3/4 350 III 5,000 2 1 500 2 1-1/4 2-5/16 1 IV 10,000 2 1-3/8 1,000 2-5/16 1-1/4 * Typical values; check manufacturer's rating for actual capacities.