Having just (10 minutes ago) completed a 95 mile trip to Los Anchorage with boat (not RV) in tow, I'd second what everyone has said and would emphasize:
- Slow is your friend, but if there's a part of the road that is straight, level, and consistent conditions, don't go 35 in a 65 mph zone....right or wrong, other drivers anticipate something below the speed limit, not 50% or less.
- Back off on the gain on the trailer.
- Plan on stopping at every light you hit. If you don't have to stop, less harm caused by a slow passage on green than a panic out-of-control slide on yellow or red.
- I don't believe in cable chains. Never had much success with them and would recommend (as above) diamond / V-Bar / Pewag chain chains if you'll be routinely driving on packed snow, ice, deep snow etc. That being said, make sure any chains are properly tensioned so that you don't get chain lash slapping your tow vehicle or trailer.
- If the lanes in the road are packed snow (or ice), don't hesitate to use the shoulder for stopping. The difference in drag of even a couple inches of fresh snow vs. black ice is noticeable.
- Watch out for the idjits driving other vehicles.