Same here in MI. Salt, brines, sand are most common but it depends on the temperature. Below 17°f salt doesn't work. Needless to say, it's a challenge to keep rust and corrosion away. Keeping them washed and waxed does help.
My GMC is a 2018 and do my best to keep her clean.
JD338
My wife has M48 Mountain Carbon 30 Nosler and a M48 Heritage 280AI, both have Rifle Basix triggers. I have 2 M21's, the both have Trigger Tech triggers.
JD338