I recently upgraded front coilovers to Fox 3.0 with adjusters and rebuilt rear Fox 2.5. I was running KO2 in a 315/70r17 E rated for years and had fun and got 70k miles on em. Tried the KO3 F rated 14 ply in the same size and rode stiff and looked a little smaller than its ko2 twin. So I saw the 37x12.5r17 D rated 8 ply is a pound lighter than the Ko3 in the OEM 315/70r17. So naturally I threw on the 37 …to save weight… haha! Couldn’t be happier…so far, haven’t broken anything yet