Our Westfield swing away movers use hydraulics. They use hydraulics and your tractor has to be running to move them. With these electric units you can run them from the cab of the truck as you back up so you can shut the tractor off as soon as you are done unloading rather than having to move the truck, get out and walk around the other side, then swing the hopper, then shut the tractor off.

Personally if I can't have a pit I'll stick with our copy of a Batco drive over. Half the price of a real one and works just as good. Really nice when you set up at a bin that holds 30+ loads or at the wet corn bin.