What are you driving? Some would say that 15" rims won't work on a KK but if you get procomp series 51 or 52 (not sure) with 3 1/2" backspace (might be 3 3/4" bs) they fit. I haven't tried them with tires yet. 8" wide may be a problem but 7" might work. Let me know what you find out if you pursue this. I'd like to put on some 8" wide to fit the tires I want but it'll be awhile before I continue.
Also, on another note, I have my stock 225/75-16 goodyears for sale, $300.00. They're almost like new, less than 10,000 miles on them and most of them was in the snow so there wasn't much wear.
2010 KK Sport, Detoures Knucklebone & backbone, smittybilt XRC 10, rigid led lights, R/L sliders & rack, cb, EMT2, R/K 15x7, OME, JBA, mopar skids & hitch, headlight covers, 4.10's and TruTracs