Got the Goodyear's mounted up over the weekend. The sidewalls are definitely stiffer than the KM2's, but they ride good on the road and are as quite. The Goodyear's are a heavier tire for sure, and for some reason they are taller, even though the 37's are listed as 36.8" from each manufacturer. When I put by brand new spare BFG up next to the Goodyear, there was over an inch of height difference. I picked up about 3/4" of clearance under my differentials, I'm sure the stiffer sidewalls also help. I did have to have these balanced, worst one took about 8 oz. of weight. The BFG's have been on my rig for a year and have been smooth with no balancing, but I've also cut two sidewalls in the last year........so there's always trade-off's I suppose........
I also replaced my 100W Lightforce Striker 170's with some new 35W Striker 170 HID's, I thought my original one's were bright until I turned these damn things on!