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Conveyor belt truck

It's a fighter plane.

Operation order:
detach trailer
reverse to the back of the trailer and press numpad 3
press numpad 4 to detach from dolly
go under the rock dispenser and press alt+view pitch to lift the skirt
lift the boom using alt+throttle
start the conveyor using pitch (right direction is the one that has exhaust coming out of the side)
press f to get in free camera mode while keeping the pitch key pressed and release the rocks

x locks the rear steering axle

Random load to use the thing in the city or whatever
http://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?edit=true&id=1144178563

Doesn't work with 1x1 pieces, too tiny.