Welcome fellow Colly camper. I too have a 2016 duramax with a 2011 Eagle. A great match IMO. I started with an add a leaf and after a few thousand miles decided to get a leaf pack (Boise Spring Works makes them for this specific truck camper combo...they work with the Jackson Hole FWC) . It raised the back an inch and a half so I also replaced my shocks with the Bilstein 5100 RHA ... these are adjustable in ride height and so I did a 2" lift to level out the ride ...the stance is like a Toyota (my last truck). I did add a sway bar only because i was concerned about sudden fast maneuvers as the camper sits high... probably don't need it. I am considering adding Firestone ride rites air bags (had them on the Taco and they are great...much better than the Air Lifts... I went through three pair in a year!). Tires I have Cooper AT3 LT245 75 17 E rated. ( I also bought a 5th tire and a used rim to replace the ridiculous "spare" tire...useless)
There are a few possible choices that will match fairly close to the original 16" RPM...but you will notice a 2-3 mph difference on the speedo.
I love this truck...solid, lots of power and gas mileage is wonderful. I intend on having this truck a long time with the diesel.
Hey Buckland, I'm curious how much weight you carry loaded up including occupants...
And the 2"lift was front only, right? Just shocks or a full kit with control arms? Springs? Curious what you went with...
Gonna reach out to Boise Spring Works now about the leaf pack now.