Muleskinning. No, that does't mean removing the flesh from a mule, it means driving a team. I personally did not get much muleskinning done (I made a few furrows), but watched the other drivers as they worked the competition.
Now I shadowed the mulers. They love their animals and can extol the virtues of mules all day, but there where plenty of horses, too. Smaller draft breeds, mustangs, belgians, clydesdales....all of them have their virtues and drawbacks. The big drafts are very calm and even tempered and have no problem pulling weight, but they are so big they will overheat and take lots of feed. Mules and smaller horses/ponies dont pull as much weight as the big drafts, but dont take as much to feed and dont get over heated as fast. Horses will overwork themselves and die, or get over heated and drink themselves sick. Mules will stop when they get overworked and wont drink until their temp comes down and its safe to drink. When a horse is done for the day, you may still be able to get it to work...but with a mule if it decides it doesnt want to work anymore---you're just going to have to try again tommorrow!