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There is an upper spring, it spans from one shoe to the other. Here's a little peek at what faulty brake hardware can do!
http://www.steelsoldiers.com/showthread.php?t=5140
Bad spring would do it too. Either way that wheel (along with all the others) requires a complete inspection. When my hdwe failed on the wrecker, the shoes ground the drum in two like a cutter on a lathe.