Early to mid 1970's I drove garbage trucks. Raccoons are notorious dumpster divers. When the truck backed up to the dumpster they would often "sit tight" in the dumpster, thinking they were safe if they stayed hidden. By the time the dumpster is leaving the ground it's usually (but not always) too late for them to escape and they wind up going for a ride. In a compactor type truck it's usually fatal for them. In a large non-compactor scenario, like a large roll-off box unit, they will often ride all the way to wherever it gets dumped. The container will tip up; contents will all come falling out; next thing you see is a raccoon crawling up out of the contents, looking around with a "where am I" look on its face. Have seen that many times.