Well, I HAVE seen guys chain trailers. Up here in the blustery North, when the passes have snow on them 6 months out of the year, commerce would shut down if no one towed in the snow. I do it all the time. It really isn't a big deal. I've spent a lot of hours towing big stuff in icy, snowy, and blowy conditions.
My setup requires me to have good traction tires, 4 wheel drive, and possibly chains on one axle of the trailer for braking (but only when it is REALLY bad). If you don't have chains on the trailer, turn the trailer brakes down so that they don't lock up easily. You are going to be going SLOW anyway, right??? If I put chains on the truck, it is ALWAYS all four when towing. You can't afford to have your rears break loose on you when you have a trailer.
The main thing to remeber is that if you think you are going slow enough, half it and go that fast. If 30 feels comfortable, go 15 or 20.
And don't sweat it. YOu gotta understand that these Texican's lives shut down when the white stuff flies.
We've had snow on the road for 2 weeks straight over here. I haven't even put my truck in 4x4 yet!