I just wanted to put this here for anyone else in the future looking. The threads that are out there aren’t very clear. I spent days digging through all the old posts and comments. 275/65R20 do fit on my gen 3 2015 EL Limited without any modifications. It is stock heigh and stock wheels. It definitely seems to ride a little better than the 275/55R20 that I had on it. You can feel that they are bigger but it just feels smoother. I plan to eventually do a leveling kit of some kind to add a little more clearance but I put them though all the tests I could and it didn’t rub at all. These are 34.1” tires.