Can a Trailair Pin Box be Used with a Gooseneck Adapter

Updated 02/16/2026 | Published 03/30/2015

Products Featured in This Question

Curt Air Ride 5th Wheel Pin Box - Lippert 1621 & 1621HD - 21,000 lbs

(90)

$1455.23

Convert-A-Ball Cushioned 5th-Wheel-to-Gooseneck Adapter - 12" to 16" Tall - 20,000 lbs

(992)

$607.77

Question:

trailair pin box on trailer to a colibert #205 gooseneck are these compatible

asked by: Robert C

Expert Reply:

I have checked with my contacts at our gooseneck adapter manufacturers, and adapters are compatible with the traditional trail-air pin boxes.

My contact further explained that this adapter is not compatible with Trail-Air's Rota-Flex pin box. This is due to the forward and rearward movement in this pin box.

If you have a traditional trail-air pin box that then this adapter will work great for you.

A very popular option is the Convert A Ball part # CAB-C5G which will attach to the king pin and provide a gooseneck coupler.

expert reply by: Jameson C

Roy

3/2/2020

I see that u can use the adapter with the trail air pin box can u se both with a 4” offset b&w ball since I have short wheel base truck

Chris R.

3/3/2020

The adapter can indeed be used with an offset hitch ball, but since you're going with this style of gooseneck adapter anyway, you may as well use the offset version # CAB-C5GX1216 instead. The adapter itself provides a 7-1/2" offset for cab clearance with your short bed truck.

Helpful Links

Gooseneck-and-Fifth-Wheel-Adapters/Convert~A~Ball/CAB-C5GX1216.html

Tim F.

2/13/2026

i just saw your post i have 2017 trailair 5th wheel hitch non flex or roto just standard.. you advised you spoke with ppl who kknow what is safe i got the cgc gn adapter and have since seen posts that is is not advisable or safe i just installed and have yet to pull my trailer as of now is it still safe to do so?

Kate F.

2/16/2026

@TimF Great question Tim. Yes, it is safe to use the gooseneck adapter to move your trailer. If you are repositioning it or towing it a short distance carefully, you are not putting yourself in immediate danger. The adapter will couple securely to the ball and function as intended for limited use. Where it becomes less ideal is for everyday, long-term towing. Because the adapter moves the pivot point lower than a standard fifth wheel hitch, it adds extra leverage to the pin box and frame. Over time, that additional stress can contribute to wear or potential structural issues.