Slow the fuck down. If you slide on ice and damage anything or anyone they will say it’s your fault for not driving to conditions and they will be right. If you’re not comfortable driving in current conditions shut the fuck down and if anybody asks why say its for safety reasons, if a company fires you for refusing to drive in unsafe conditions that’s on them.
When you park for the night in freezing temps keep your trailer brakes released, if they got wet from snow or anything they will freeze together as they cool down and it’s a pain in the ass to beat them free even when you have a good enough sledgehammer. Simply setting only your tractor brakes will help prevent this.
Get some good fuckin boots dude, wet socks in this kind of weather absolutely sucks and the $60 at Walmart for a pair of water resistant boots with good treading is a great deal when they can literally save your life. I’m an arizona boy so I wasn’t really ready for the serious winter conditions up north like in Montana and the Dakotas, I’ve fallen on my ass too often to not bring this up.

