AP03 C392 Rear Gooseneck Adapter w/ 2-5/16" Ball & 2" King Pin for Trailer Fifth Wheels EW-C392 This gooseneck adapter is designed to convert a fifth wheel plate to a gooseneck trailer setup.It features a 2 inch kingpin and a 2-5/16 inch ball with an 8 inch diameter mounting plate, enabling compatibility between a No.5 wheel hook or pickup No.5 wheel hook and a standard gooseneck ball coupler on a trailer.The adapter supports a gross trailer weight of 30, 000 lbs and is constructed from steel with a black powder coating for corrosion resistance.It is built as a one-piece unit to uniform load distribution and structural strength.Installation is straightforward and does not require welding or modifications to the vehicle chassis.This adapter is suitable for use with trailer fifth wheels that have a fixed orientation, as it may not be compatible with rotating fifth wheels that do not lock in position.Spacer use is recommended if movement occurs during.