I had issues with my 2014 Escalade last month, bought it used back in may, rode way too hard and had a weird rolling sensation, at first i thought it was the 285/45-22 tires, turned out it was both of the front magnetic shocks were shot.
Never owned a moderate performance vehicle before, but it was a very easy drive from just north of Anchorage to Fairbanks this summer, it would cruise at 100mph with ease, its just a Caddy with a plain 403hp 6.2 engine, NOTHING like real performance cars, but at least i can drive it year round in Alaska. Just put Blizzaks on it.
Yes, I have summer tires on my C300 (Michelin Pilot Super Sport). They are super grippy unless it rains. On my Audi I still have the oriinal Pirelli P Zero tires. For the Merc I have a second set of wheels with winter tires - Yokohama Ice Guards. About time to change tires on the Merc.