I've raced a couple 6th gens so far. From a dig, I have no issue pulling them. They move out pretty well from a roll though. I only put 2-3 cars on the ones I raced from 40-130ish.
I have a ported CJ setup with full exhaust, some weight reduction, and running 91 pump gas. 2 of Camaros have headers, intake and E85. All of use have auto trans.
I think bone stock they make roughly 400-410rwhp. They're much stronger than the 5th gens. Chevy really nailed the stock tune as well, so don't take a stock one lightly.
Having a hard time believing you can put 2-3 cars on a modded SS without a power adder on the Coyote.