GMC towing package and the Ultimate Fifth Wheel Connection safety chain location?
GMC has been very quiet about there towing prep package so we don't know a lot of detail about them. The good news is that our Ultimate was designed to be the most universal 5th wheel hitch on the market today utilizing the connection to any gooseneck ball for the connection point.
The ford pickup have the pucks on the inside of the Ultimate pads and we just use puck safety chain connections if a customer chooses to use the safety chains. On the dodge pickups the pucks are under the Ultimate Pads and in that case we are able to use a hole saw to cut a hole in the pad to allow the puck safety chain connections to fit thought. If on your new GMC if it is similar to either case you are good to proceed.