The only style of 3 inch gooseneck coupler that we offer is the Redline Trailer Coupler # WF2. This coupler uses a steel pin to secure the hitch ball. view full answer...
We have the Gooseneck Coupler - 24K, Item # SM2516NP, that can be welded to a 4 inch square inner tube. This coupler does not come with the tube so you would have to remove the fifth wheel king pin from your coupler and weld the gooseneck coupler to the existing square tube or weld the coupler to another tube and install it after removing the existing coupler and inner tube. At this time we do not carry the replacement 4 inch square tubing for gooseneck hitches. view full answer...
Most customer oriented business I have dealt with on computer generated orders. Product was just as I odered with no complications and I received it much faster than I expected.