Best idea (ULTRASPORTs) buy a winter "beater". For Cincy, any FWD economy car should do fine. (But then you live there so you already know). If you absolutely must drive your XF in the winter then (REDSC400s) advice to use "Blizzaks" on all 4 wheels should do fine. I'd recommend checking EBAY for some used 16" SLK wheels, or any large auto recycling /salvage yard. Wheel cost? What ever you can negotiate. Tires, about $500 mounted and balanced. Owners man. says vehicles max. weight cap. is only 415 lbs. so don't go overboard on ballast.