what has changed in the front suspension of 2016 GMC3500HD diesel duallys.

Tires rotated as needed?

Hello, I have not heard of a "known" issue with "cheapening up" the front end of a GMC truck. Wheel alignment related tire wear issues are and always will be related to road conditions, use conditions, lack of tire rotation issues, vehicle weight issues, towing use issues, and so forth. Anytime you change the geometry of the suspension (think: Load carrying, towing tongue weight), you change the alignment angles of the wheels. The ride height will change as the vehicle changes in load carrying. I'm not sure what you use the vehicle for, but consider this in all honesty. If you are constantly towing a load or carrying a heavy load in the bed of the truck, consider having a wheel alignment performed that considers these factors when setting angles. The tires should be analyzed by a good shop to determine exactly what kind of wear you are experiencing. If it is more edge wear and feathering, you could have a toe issue from road conditions. If you have cupping, you could have suspension related and vehicle weight related issues. Agree that tire rotations help, but many folks do not bother rotating tires on vehicles with dual rear wheels due to the time and expense of the service. Blaming your problems on vehicle design is not helpful and likely inaccurate.