I also did 2 sizes up ridge Grapplers(285/75/17 on stock wheels).
Some points I've had issues with when pulling heavy GN trailers and going with large tires.
If your OEM GM stock wheels are the 6 1/2"-7" GM uses then you have too big of a tire and will always have issues with carcass roll/tread squirm when carrying weight and a heavy trailer pushing you even after the tire has ran 3k miles for a good break in. Load carrying tires need a wheels width to match the tires tread width.
Now if were doing some type of racing then we can play with wide or narrow wheels for certain traction or handling requirements.
The Ridge Grapplers show a tire with large lugs and voids which also can lead to tread squirm.
A 285/75 tires can have a 8.5"-9" tread width....now mount them on a narrow wheel with a 6.5"-7" wide wheel will basket ball the tires tread and sidewalls. Pump the tire to high pressures for the load and the tire rides the center of the tread producing a squirrely handling truck. Lower pressures can produce carcass roll and a hot running tire when carrying loads.
Once the tire is broke in then find which tire pressures make the best handling and a cooler running tire.
