Yes, that pin fits between the hitch head and the shank. As stated it's used to adjust the angle of the hitch head. You may have noticed (or not) that the two big bolts seemed kind of sloppy before you torqued them down? That's so you can tilt the head to keep your equalizer bars level with the trailer frame when they are sucked up tight for travel. You can't rely on just the bolts to hold the angle on the hitch head, you need that pin inserted between the hitch head and shank. Stack washers on the pin the get the correct angle before torquing the two big bolts. Hope this helps. Hans
2003 GMC 2500HD CC Longbox SW/
2002 Wilcat Bunkhouse 30'/
1987 Western Wildderness 11' Alpine Truck Camper/
1971 MacGregor Venture Sailboat Rig Pictures, click on this link.~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~