I don't plan on taking mine out in the snow but I have a LOT of experience in driving in the snow! My truck, a 4X4 dually, will sit on the thinest layer of snow and just spin in 4X4. However, when I put 500# in it, it is another vehicle completely. The key to the process is putting the weight directly above the axle. I have tried it in other positions but it is a waste of time and gas. Your 100# should work well but make sure the weight is braced in exactly the position you want.

I was looking at my Conti's and there tread is relatively aggresive so you should be OK there. I don't think you can go in very deep snow. Not because of traction - those big fat tires will snow plow.

You have a real challenge. Some of the worst snow I have ever seen has been from Buffalo to Syracuse and from Watertown to Syracuse. Good luck!