I bought a set of 4-link ladder style chains with v-bars for my TC33D from Tirechains.com They've worked out well on ice while clearing my driveway in the winter... there is one hill that I just could not handle without chains (and it faces east, so it tends not to melt off very quickly). 4-link refers to the number of links in the side chain between each cross chain. The "V-bars" are basically studs welded on to the chain to give better traction on ice. I had considered the 2-link chains, but they were jus too heavy to deal with. They may have given a bit more traction, and a bit smoother ride, but the 4-link turned out to be all I needed.
I was originally looking for the "Duo-grip" style chains. These are closer to what you'd see on a logging skidder. They form more of a "mat" around the tire with diamond or square shaped openings, rather than the ladder pattern on the chains I ended up with. The Duo-grip style does help keep the chains from falling down into the tread of R4 or AG style tires, and would also probably provide better latereal traction when operating on side hills. Unfortunately, no one seems to make them in a size to fit the R4 tires on my TC33D. I've been told that's because the pattern just doesn't work out right on this size tire.
Another option that someone here mentioned is the "Double Ring" chains. These are great in Mud and snow... there is not much that can match them in that application. They tend to be self cleaning, so they don't load up with mud or snow and lose their effectiveness. I've heard they are not as good on sheer is as chains with v-bars, but I don't have personal experience with them in on ice.
John Mc