I almost killed my self driving a Mustang in the snow one year. That following spring I sold it and bought a Land Cruiser to drive in the snow because I didn’t want to drive off an over pass or drift into a snow plow that’s dive bombing downhill. (That’s how it almost happened)
I actually got mine FOR winters!
It was more or less rust free, or seemed that way. After a year or two in Colorado the rust began to show in the typical areas. I never used fluid film or anything like that.
Now I’m in Bozeman and my truck has been parked for a while for an engine overhaul. While it’s out I’ve been stripping the engine bay and painting things. When I get it all back together I still intend to drive it in the snow, but this time I’ll use fluid film or something similar.
I want a 4x4 truck to drive anywhere anytime. I’m not worried about it getting rusty. It’s going to happen unless you keep it in the garage and never use it. That being said, rust retardation up here is paramount if you wanna keep that truck safely on the road.