My tires are the KM2 and they are 37x12.50x17 I just got back from a rock crawling trail with a team of jeeps and the BDS lift and tires performed like a champ, tons of traction.
I would recomend the BDS to anyone that does even a little bit of offroading since the kit is basically a skid plate for your engine, nice thick thick steel. Actually hit a couple of big rocks and its hard to tell where it happened.
Also I have towed and been offroad with both and have had zero problems.
I've got a lot of questions for you since you have a similar set up to what I want ... Are those BFG KM or BFG KM2? Are they 37 X 12.50 or 37 X 13.50? Any issues with the BDS lift thus far? Any concerns with towing and ride height? I plan to go bigger with my rig and already have 4.56 gears, your insight is appreciated... thanks for the info.