It's been said time and time again, it is NOT the negative camber that shreds the tires, its the negative camber in conjunction with the Toe setting on the rear that shreds them.

The popular wear items are the ball joint in the wheel carrier, as well as the wishbone control arm to get the camber back into spec. However, once your camber is back in spec, I highly recommend setting your Toe in the rear to .01, in order to save future sets of tires.

For what its worth I have almost 10k on my Toyo Proxes 20" staggered tires, with -1.9 in the rear left and -2.9 in the rear right on camber at my last alignment last year, have not touched the rear suspension yet. I had the shop set my toe to zero and haven't had an issue with irregular wear.

__________________
2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards