5th Wheel King Pin Box for Gooseneck Hitches

These 5th wheel King Pin Boxes for gooseneck hitches replace your king pin box on your 5th wheel trailer. The king pin boxes are rated at 24,000 pounds of towing capacity and use the PopUp Self-Latching remote unlatch gooseneck coupler. They come in two categories, one has an adjustable coupler and the other has a fixed coupler.

If you want to know the location of the gooseneck trailer coupler using the new king pin box (because these king pin boxes fit several different models) below is how to calculate the location of the (top center of the gooseneck ball) coupler.

From the center of the most forward and lower bolt hole (on the king pin box of your trailer) measure forward 19-3/32” and down 19”-15/32” for the fixed model, and the adjustable model is forward 19-3/32” and down 19-1/16” to 23-9/16”. This will give you the location of the center and top of your gooseneck ball with your new 5th wheel king pin box.

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