In my book series, one of the main cultures has domesticated Diprotodon Optatum (called "Bunyips" in-universe). For those of you who don't know, here's what they look like (they're the herd of giant wombats in the background):
In size, these behemoths are about 9.8 feet long, 6.6 feet tall at the shoulder, and weigh about 6,150 lbs. To a civilization living in what would best be described as a much more mountainous version of Pleistocene Australia, what would these creatures best be used for if they were domesticated?