Abstract: A plurality of hydraulic jack assemblies are located adjacent the wheels of a recreational vehicle. The jacks are initially extended until each jack contacts the ground with a relatively low initial pressure. Thereafter, the jacks are individually actuated as necessary to bring the vehicle to a level position. After leveling, the jacks are once again actuated to ensure that each of the jacks contacts the ground with at least the predetermined pressure. A relatively large, circular foot pad is fitted to the bottom of each jack to distribute the contact force over a relatively large area of the ground. Each of the hydraulic jacks includes a bracket, having a three sided channel member, for receiving the lifting force developed by a hydraulic lift cylinder and for transferring the lifting force to the frame of the vehicle. A hand held controller having a relatively long extension cable, permits operation of the automatic leveling system from outside, as well as inside, the vehicle.

Abstract: A tilt indicating device mountable on a tiltable vehicle or machine component and operable to close an electrical circuit to thereby give an audio/visual warning or initiate levelling action in case of tilt. The device comprises an insulated housing having a chamber therein filled with electrically non-conductive viscous damping fluid in which a float is submerged and upwardly bouyed. An electrically conductive ball and socket pivot assembly connects the float to the chamber floor and enables tilting of the housing relative to the float in any direction from vertical. An electrically conductive circular disc horizontally mounted on the float stem and electrically connected through the pivot means to a connector terminal on the exterior of the housing is spaced from but engageable during tilt with the upper edge of an annular collector ring mounted on the housing floor and surrounding the pivot means.