AP03 12" to 16" Adjustable Cushioned 5th-Wheel-to-Gooseneck Adapter #C5G1216 The adapter converts a trailer's kingpin to connect to a gooseneck hitch.The sliding collar with set screws allows adjustment to any height between 12 inches and 16 inches from the of the gooseneck ball to the kingpin plate.Designed for use with camper, RV, or trailer kingpin boxes.Not suitable for trucks with beds shorter than 6 feet or cushioned style kingpin boxes.Towing capacity is rated at 20, 000 lb GVW with a tongue weight capacity of 4, 000 lb.Features a 360-degree swivel with vertical movement and a coupler that can be secured with a padlock.Installation requires no drilling or welding.Provides reduced wear and tear on both trailer and vehicle.The fully adjustable design ensures proper alignment and stable performance during use.Tested for and long-term functionality.