Driving in snow while towing means driving slow. Been there, done that. I had no problems after the first few miles and figured it out. We're talking blizzard, snowing, snow covered interstates where the road department had not cleaned anything off.
First ... slow ... I mean we could barely get over 25 mph, but we had to keep moving. No choice when that happened.
Second ... never use the tow vehicle brakes. I relied on the trailer brakes if I need to slow down, but mostly, just let the entire rig slow on it's own by taking my foot off the gas peddle.
Third ... watch as far ahead as you can see to give yourself plenty of time to react with the slowest reaction possible.
Fourth ... drive in 4 wheel drive for maximum control of the tow vehicle. Especially in the mountains of Southern Kentucky and Northern Tennessee, this was an absolute must ... and most important if using an exit ramp to be in 4x4.
Fifty ... you cannot get in a hurry. In weather conditions like this ... it's 100% about safety, NOT SPEED! You have to forget about red-necks behind you. If they are THAT desperate, they will pass. Otherwise, ignore them. It's all about YOU getting "there" safe! Yes! under these circumstances, it really IS all about ME! (or you!)
Sixth ... If you have to stop, there is nothing wrong with spending the night in a motel!