Sorry man i havent been on the site in a while. Its going to be a tight fit with 305/55's and 20x10's with just a leveling kit. You will end up cranking quite a bit and trimming. But it can be done. I've seen a 04 sierra with 20x10's and 33x13.5 tires. Its just a matter on how much you want to crank. My wheels have a 4.5" Back spacing and a -25 mm offset.
hey whats going on buddy, i was looking at ur set up and it looks really nice. i was just wondering what youre offset and backspacing is on those wheels. i was thinking of getting 20x10s with 305-55-20 and was wondering if they would fit on my 05 1500 i have a leveling kit on it.