conjunction with a walking beam in order to achieve two axis of oscillation." This type of suspension allows to be loaded on an axle group. In trailers, leveling jacks may have trunnion mounts. In the valve train of a pushrod engine, the term refers to the fixed axle that acts as a pivot point for the valve rocker. In other technology In steam engines, they are supporting gudgeon pins on either side of an oscillating steam cylinder. They are usually tubular and convey steam. On communication satellites, the antennas are usually mounted on a pair of trunnions to allow the beam pattern to be correctly pointed on the Earth from the geostationary orbit. On stage lighting instruments, a trunnion is a bracket attached to both ends of a striplight that allows the striplight to be mounted on the floor. Sometimes trunnions are also equipped with casters to allow the striplight to be moved easily. In woodworking, they are the assembly that holds a saw's arbor to the underside of the saw table. In waste collection, the trunnion is the bar on the front of a Dumpster that connects to the back of a garbage truck. On the Space Shuttle, trunnion pins are affixed to the sides of payload items allowing them to be secured to receivers mounted on the sills of the payload bay. These receivers can be remotely commanded to secure and release selected items. Similar keel pins protrude from the nadir side of payload items, into matching holes in the bottom of the payload bay. On hydraulic cylinders, a trunnion (either featuring external pins or internal pockets) can be an alternative body mounting type, as opposed to a flange or pin eye. In steelmaking, on the Bessemer converter. There are trunnions on either side to be able to pour out the molten steel. In surveying total stations and theodolites, the trunnion axis is the axis about which the telescope transits. It is parallel to the horizontal axis defined by the tubular spirit bubble. In Dobsonian telescope designs, commonly known as altitude bearings. In structural engineering, a type of bascule bridge, with the road deck on one side of the trunnion, and the counterweight on the other. In laboratory centrifuges, trunnions are used to pivot sample buckets in swinging-bucket rotors. In nuclear power plants, when the steam generators are replaced, trunnions are used to upend them, to get them