A buddy brought a more generic rolling stool to one race and I thought it was a waste of space until we got there. So, now I'm a big believer in 'em.

This particular stool folds flat for easy transport/storage and only cost me about ten bucks.

If you're so inclined, you can get jumbo casters for it from your local hardware store for some of the rougher pit areas out there.

Harbor Freight also has another nice alternative in it's pneumatic roller stool (#45342). →

The adjustable height and the tool tray on the bottom make for a better stool and, if you have the storage space (mine stays at home), this may be another good alternative for you. This one runs for about twenty five bucks.