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 Liberty KK Sport, deep water blue, weathertech in channel vent visors, weathertech digital floor mats, Detoures backbone winch mount w/smittybilt XRC 10 comp winch, rigid industries dually led lights on smittybilt fairhead mount, Rocklizard skink supersliders and Gecko safari rack, cobra cb w/48" firestick antenna, general grabber at2 245/75-16, OME heavy duty springs, OME shocks, about 3" - 3 1/2" of lift, Detoures Knucklebone spare tire and Jerry can mount, mopar skids, class 3 hitch w/7 pin wire harness, headlight covers, 4.10's and Detroit TruTracs F&R