I put the spacers on before the level, with the stock 255 65 r17 tires, and there wasn't any rubbing. I'm not sure, but I would guess that you can't run much larger tires than that, with the 2" wheel spacers, without rubbing. If you are gonna go with a 6" lift, I would hold off on a leveling kit in the mean time, and just put the $ towards the 6" lift. Then once you have the 6" lift get the right size tires for the lift. If $ isn't the issue, you could get the level and some 265 70 17's in the mean time, but your probably looking at roughly $1500 for the leveling kit install, new tires mounted, balanced and aligned, that you would just be replacing in the future. Not to mention, you would then need to trim the wheel wells. I would love to do a six inch lift on my truck, but the cheap level was as much as I could justify financially. I bet a 6" lift with 2" spacers would look bad ass!