I've been thinking about doing this for my trash hauler; the lad on the back of the truck has to wheel the bin to the truck and line it up with a hook and run a hydraulic device to dump it, but sometimes he judges (I think) the weight and lifts it manually, probably to save time.
It would be neat if that could all happen automagically. In VA, there was a pair of arms on the truck that did it all, driver never left the cab.