Danny, yes for the '16 you would need the CAM Module, but starting with the 2017 GMs are compatible without the adapter. Had one in my '11, but pulled it out when I got the current '18.
I would check with a buddy or someone and verify that the brakes actually would on the Monty.
Michelle & Ann
2018 Chevy 3500HD High Country DRW 4X4 Crew Cab w/Duramax/Allison, Formally 2010 Montana 2955RL, Now Loaded 2016 SOB, Mor/ryde IS, Disc Brakes & Pin Box, Comfort Ride Hitch, Sailun 17.5 Tires.