I'm looking to go backpacking over the winter with my son (14) and am unsure of a tent. I've looked at a few 4 season tents that seem great except for the price. They seem a little over kill here in NJ. The worst I'm looking at is 20 degrees give or take, 4 to 6 inches of snow in a surprise, and probably won't be more than 4 miles from the nearest house or road if need be. An alpine tent seems a little over kill for my situation, would a good three season tent be adequate under such circumstances? Any caveats about moisture or warmth in a three season that I should be mind of ? Weight is a minor issue at this point as our forays will be minimal, a day or two and sometimes a float trip on the river during warmer weather.