I'm getting a little embarrassed. I have gone through 4 belts in the last ~325 miles. I'm ready to purchase a laser tool to align the pulleys. I can't figure out what isn't lined up. This time the belt didn't come off but split down the middle. I pulled over and removed the broken part and drove home at 25 mph hoping the unbroken part of the belt would hold. It did.

Anyone have any other suggestions?