How do I know if my 2016 GMC Sierra has the Factory 5th Wheel Prep Package?

The prep package sits tightly against the top of the frame and is welded to the side mounting brackets. 4 pucks in a square or rectangular pattern will be located in the bed of the truck - this is the prep kit. 

 
                                                                                                                  as taken from GMC.com

See our "WITH OEM RAIL KIT" category to find a Fifth Wheel Hitch for this prep kit or call our team of experts at 1-800-300-4067 for assistance