Our team decided to make a track system for our drive train this year. We used V-Belts for the tracks, so the tracks are very strong and provide a lot of traction. We were a little worried about belt slippage, since there are no cogs on our belt wheels or anything to provide reinforced grip on the belt, but we haven't had a problem. Everything is gripping and works great
This year's drive train was a big jump for us. We used casters and back drive wheels in our first two competitions.
I am wondering how many track robots we will see this year. Tracks seems to be the way to go for getting on top of that center platform, especially if you're trying to get directly on top from the 6 inch high side.