Join Date: Apr 2017
Location: Redmond, WA
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The way the deDion rear suspension works, suspension movement doesn't alter the camber that is presented by both wheels to the ground. In essence, the rear wheels are fixed in relation to each other and the entire fixed assembly moves in response to the ground and to the car. So whether you have 100 or 300 pounds added to the car, the rear camber stays the same.
I have something like -1.8 degrees of camber at the back. On my (sold) Miata, I ran -2 degrees in the back. This did not create any inner shoulder wear as long as toe was in spec. I ran 1/16" toe in at each rear wheel, and I think my Smart has around 1/10" in at each rear wheel. These should result in basically zero dynamic toe under power and then not wear the tires abnormally at all.
So it might be worth it to get a check and see what your alignment specs actually are.