Set the brake controller as if you were going to pull on dry pavement. The trailer brake should set up just slightly before the rear brake on the tow vehicle. Slow and steady as she goes, don't use the cruise control. As other have said, no sudden moves and leave enough room between you and the guy ahead of you. And yes, don't be afraid to bump the brake controller manually if you find yourself going a little faster on the other side of that hill. Just a little resistance will keep the tt from passing you up. However, don't be a hero and try to get some where if the roads are next to impassible and don't try to out run any snow storms. Maybe you could have a plan to call a family member every hr or so in the event you go off the road so they can call for help if they don't hear from you in the second hour. Just a precaution is all. Rescuers will have a general location of where to look for you. If the weathers good I wouldn't do the phone calls.