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Gooseneck Trailer Hitches Information

GOOSENECK HITCH SYSTEMS
  •  Gooseneck Hitch Systems conveniently allow unrestricted use of the pickup bed. In-truck platforms support 2-5 ⁄16” and 3” hitch balls. All framework for Gooseneck Trailer Hitches reside under the bed of the truck with only the ball exposed above the bed of the truck. Stronger, and able to utilize the full suspension of the truck, Gooseneck Hitch Systems are rated up to full towing capacity of the vehicle as determined by the manufacturer. Draw-Tite Gooseneck Hitch Systems utilize a unique set of mounting rails, specific to each vehicle, that will accommodate any of the hitch heads.
HOW LARGE OF A TRAILER CAN I TOW?
  •  Each truck has a published Gross Combined Weight Rating GCWR. This is the maximum allowable tow rating in terms of the combined vehicle and trailer weight. When the Gross Vehicle Weight GVW is subtracted, the maximum Gross Trailer Weight is revealed. • In this example, the maximum allowable trailer towing weight is 12,800 lbs. GTW. The rail kit for this vehicle has been tested to meet maximum vehicle tow capacity.

COMMON TERMINOLOGY
  • Base Curb Weight - The nominal weight of a vehicle with standard equipment and a full tank of fuel. It does not include passengers, cargo or optional equipment.
  • Commercial Towing - Any vehicle/trailer combination exceeding 26,000 lbs. Gross Combined Weight GCW.
  • Commercial Vehicle - Any vehicle that exceeds 10,000 lbs. GVW.
  • Gross Vehicle Weight (GVW) - The actual weight of the vehicle when fully loaded. It is the base curb weight plus the cargo weight.
  • Gross Vehicle Weight Rating (GVWR) - The maximum allowable weight of the fully loaded vehicle.
  • Gross Combined Weight (GCW) - The actual weight of the vehicle and trailer combined. This weight should always be obtained by weighing the vehicle and trailer together on a scale.
  • Gross Combined Weight Rating (GCWR) - The maximum weight of the towing vehicle and the loaded trailer - including cargo and passengers.
  • ​Gross Axle Weight (GAW) - The total weight supported by each axle (front or rear). To compute this weight for your vehicle and trailer combined, take the loaded vehicle and trailer to a scale. With the trailer attached, place the front wheels of the vehicle on the scale to obtain the front GAW. To obtain the rear GAW, weigh the towing vehicle with the trailer attached, but with just the four wheels of the vehicle on the scale. The rear GAW is determined by subtracting the front GAW from that amount.
  • Gross Axle Weight Rating (GAWR) - The total weight each axle is capable of carrying. The total load on each axle must not exceed its GAWR.
  • Gross Trailer Weight (GTW) – The weight of a trailer fully loaded.
  • Maximum Loaded Trailer Weight - The maximum allowable fully loaded weight of the trailer. This weight is obtained by subtracting the towing vehicle’s GVW from its GCWR.
  • Payload - The combined maximum allowable weight of cargo, occupants and optional equipment that the vehicle is designed to carry. (Gross Vehicle Weight Rating minus the base curb weight.)
  • Rail Kit - The components and hardware that mount the gooseneck hitch to the vehicle frame.
THE SAE INTERNATIONAL J2638 STANDARD FOR GOOSENECK AND FIFTH WHEEL TRAILERS UNDER 30,000 LBS.

The Society of Automotive Engineers (SAE) is a non-profit educational and scientific organization dedicated to advancing mobility technology to better serve humanity. SAE has developed many standards, testing methods and procedures to measure the performance of vehicles and vehicle related products, including trailers. SAE J2638 addresses both gooseneck and 5th wheel trailers under 30,000 lbs. The testing methods for gooseneck are as follows:
  •  Static Testing is a one time maximum load requirement for the three test conditions. The test is to be maintained for 5 Seconds. •
    • Vertical - tests the goosenecks ability with upward and downward pressure -
      • 85% of GVW Pull Out (25K lb Gooseneck = 21,250 lbs)
      • 50% of GVW Down (25K lb Gooseneck = 12,500 lbs) 
    • Longitudinal - tests the goosenecks ability with front and back pressure
      • 75% of GVW Front and Back (25K lb Gooseneck = 18,750 lbs)
    • Transverse - tests the goosenecks ability with side to side pressure
      • 0% of GVW Each Side (25K lb Gooseneck = 7,500 lbs) 
  • Dynamic Testing defines requirements for repetitive testing in the three test conditions. 
    • 300,000 Cycles in each test condition. - (Vertical, Longitudinal and Transverse)
    • The same unit is used for all three tests. - (900,000 Cycles all together) 
    • The range of load requirements are based on GVW and Rated Coupler Load.
  •  In order to assure safety and accountability for the products produced, SAE J2638 also requires:
    • Product Identification
      • Manufacturer’s Name
      • Maximum Trailer GVW
      • Rated Vertical Coupler Load
      • Ball Size
    • Testing
      • Products are to be fixtured at the maximum stress conditions
      • There should be no loss of attachment during testing
      • When testing is completed, the coupler will be capable of being uncoupled and coupled

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