Problem 1991 Buick LeSabre

First I hear some scraping, and then usually the rear brakes totally fail, and car cannot be driven at all. I believe I have been told it is the rear brake drums that shatter, then need to be replaced, with wheels kits ordered, and some type of spring. Please excuse that I cannot describe this better! This has happened to the car 4 times since 2002 and is quite expensive to fix. Is this common with this model? I got it as a gift from uncle in Conn., more moisture there, now car is in desert, could that have something to do with it? I am not a heavy braker, but the car is quite heavy. Thanks!