They are called Husky liners. They are not cheap but will last the lifetime of your vehicle.

 

Dude don't trade the 17" wheels. The tires for the 18" wheels are expensive and availability of 18' tires is limited. You'll have more tire choices in 16 or 17". I have 2 full sets of like new Sahara wheels and tires here that I haven't been able to sell in 2yrs (and I refuse to give them away for under $1000 considering the dealer price on these is in the neighborhood of 3k for a set of 5). Also be aware that if you are going to move up a size or 2 in tire, you will also need wheel spacers for those stock wheels.

If you want to change it up, look into 16 or 17" aftermarket wheels with a 4.5" backspace then you can run up 37" tires without spacers.

 

I got the Husky Liner floor mats, they hold all the slush and snow and keep it off the carpet. They're custom made to fit for each vehicle. Expensive, (think it was $75 for the front two) but well worth it. We have them in our Dodge Ram too, and they've held up perfectly since '06.

http://www.huskyliners.com/Heavy-Duty-Floor-Mats

 

I got the dealer ones....79$ and change taxes in.