Hey guys. I am looking into lifting my GMC. I have looked at the Tuff Country 6" lift. It is a very resonable price for me. I hope to be putting 35"x12.5" BFG All Terrain tires with my existing 17" rims. Just want to know more about suspension lifts. I tow alot, off-road alot and city drive alot. Being lifted does it do anything to towing, driving ( unstable?) , gas mileage. What effects does it have on the truck being lifted? Any details or experiences would be very helpful.