[Rickertsen2]

Our second year, we had a system with two wheels and two skids like the one in the pic. It had trouble turning and was far too easy to push around. I would highly discourage this configuration.

If however you have two wheels in the middle and 4 skids at each corner of the bot, you have a highly maneuverable bot. We have tried this config with great success. It still suffers from the problem of being easy to rotate but it never presented a problem for us. If you are looking for a 2wd setup i think this would be the way to go. One thing to keep in mind with this config is that the skids must be a elevated a small distance from the height of the wheels. because of this the bot may rock slightly but it is usually negligible. This might not be a good setup for this year because it cannot climb obstacles but it is something to keep in mind.

I think the best overall combination for this yer would be simple 4wd.