Winter Prepping Supra?

I will be driving my MT Supra through the winter. For anyone else that winters their Supra, what do y’all do to prep it for winter?

Which rubber floor mats?

What size wheel and tire for winters?

Is any sort of underbody rust proofing required?

How do y’all wash it in the winter? My car is PPFed but I’d still like to get grime off periodically