Ordered a new GMC AT4 3500

[Carl n Susan]

Originally Posted by Rondo

Have heard but not verified yet-- If you have a ball hitch in the back receiver hitch, you can not use the new step tailgate. Has anyone verified this rumor yet? .

The rumor is correct.

http://gmauthority.com/blog/2019/06/...xtended-video/

[powerhaulic]

I still have my SuperGlide, but use a SuperLite now.
When I installed the air pin box I chose the long jaw version which is 5.75" longer. combined with the pin adapter for the SuperLite which places the ball either 3" forward or 3" rearward of the original king pin.
I currently have it forward so there is more than adequate cab clearance, but the back of the pin box can touch the box side rails. Before the next move I am going to reverse the pin adapter, which will still give me 2.75" additional cab room compared to stock setup.