Slide the gooseneck adapter onto the kingpin of the fifth-wheel trailer. The hitch should be facing forward.
Adjust the adapter until it is in the position recommended by the manufacturer. Hold the Gooseneck adapter firmly in place.
Place a mark in the center of the bolt openings on the adapter. The mark will be the spot on the trailer's kingpin plate where you will drill the holes to mount the adapter.
Put a drill bit in the drill. Use the size of drill bit required by the adapter manufacturer for the bolt size.
Drill the holes for the adapter. Wipe away any debris with a rag.
Push the bolts through the top of the mounting plate into the adapter. Place a washer and a nut on each of the bolts.
Turn the bolts clockwise by hand until tight. Tighten the bolts with the wrench until snug.
Apply the final tightening of the bolts with the torque wrench. Apply the manufacturer-recommended torque to the bolts.
