Brian P, Do you like the way the car looks now? I happen to love it. I have not changed rims or lowered the car. If you love or just like it go with the OE size tires in an all season brand you like. I have ran all season tires in the winter on several rear wheel drive cars. You live in Knoxville I live on Lake Michigan on the Illinois/Wisconsin border. We get a little more snow than you. I have an SRT6 I believe the other models have the same size tires. I personally would go with the Michelins Speedy 4x4 mentioned. Front Size 225/40R18 Rear Size 255/35R19. Check your owners manual under tires.

I do not believe Speedy 4x4 has made any modifications to frame or wheel wells. I do believe he is running different rims which require spacers. There is some wiggle room for tire size on OE rims. If this what you are looking for there are many threads on this just do a search.