A few suggested sway control bars, I’ve read that those are not recommended for winter use. Is there any truth to that? Any experience in winter driving with them?
Have you looked at sway control bars, and understand how they work? The amount of control is adjustable. The bar is trying to keep the truck and trailer traveling in a straight line, and it works VERY well in windy and slick roads. It makes it harder for the trailer to just kick out, or try and jack-knife. what it does instead, is it will try and push the truck and trailer together as one and reduce the chance of getting out of control, and also give you more time to recover.
Another important factor in safe winter towing is good working trailer brakes and a good brake controller. All the brakes need to be adjusted, and working evenly. Uneven or out of adjustment trailer brakes can make the trailer get out of control or a wheel lock up when it normally wouldnt.
There are many times that if the trailer starts to get a little sideways I will manually apply the trailer brakes by hand and not use the truck brakes and this will straighten it right out. I also use that method going downhill on a slick or snowy road if you just want to slow down a little, but dont want to risk getting the trailer out of shape.