A height-adjustable support for semi-trailers and the like includes a shaft tube body, a slidable support inner tube arranged in the shaft tube and body and having a foot mounted to an end region thereof by a nut located on a spindle which is drivable by a transmission, wherein the transmission has a switchable spur gear region and a beveled gear stage. The shifting region of the transmission comprises a low-gear pinion and a fast-gear wheel, wherein the low-gear pinion is coupled to a drive shaft that can mesh with a low-gear gearwheel, the fast-gear gearwheel is adapted to drive a fast-gear pinion, and wherein the fast-gear gearwheel is coupled to the drive shaft. The drive shaft is supported in an unrotatable and axially slidable manner in a sleeve bearing that is supported rotatably in at least a select one of a bearing block or load bearing base supporting the spindle.