Since it varies per state, the bast information can be obtained by going to the State websites and see what they say about where and when you need tire chains. Some places only require them on the outside dual driving axle and others want both of the duals to have chains. There are also some roads where they will not allow you to go unless you have your chains installed and there are places that will rent sets of chains for your use.
I've driven in the snow a lot and have had to use my chains often. Sometimes I needed them not so much for the roads, but they were necessary to get in to and out of some RV Parks that are not equipped to deal with snow. The vehicle weight does not have much difference in moving, but it does make a difference trying to stop on snow/ice. You need to drive carefully and be careful when on the highway and crossing overpasses that may have ice on the road surface.
I never had a problem towing a vehicle in the snow but until you get a little experience, I would avoid driving in a heavy snowstorm. You would be surprised how quickly snow/ice can form on your 4' high windshield and how long it takes for the defroster, at the bottom, to melt it. Then when it melts it can slide down and block your view for a time.
Other than that, just go for it. We love Winter travel and actually prefer it to Summer travel.
