A leveling assembly for analyzing the attitude of a structure such as a motor vehicle in two axes. The assembly drives leveling devices on the structure to correct the attitude of the structure relative to a calibrated reference point or attitude. The assembly includes a controller connected to the leveling devices and a proportional two-axis tilt sensor that is connected to the controller and supported on the structure. The tilt sensor provides analog signals to the controller that represent the attitude of the structure about longitudinal pitch and lateral roll axes. The controller also uses those signals to determine the attitude of the structure relative to a calibrated sensitivity factor and a user-defined zero point. This allows an operator or installer to determine which portion of the structure will be leveled without regard to the location of the tilt sensor and allows an installer to mount the tilt sensor at any point on the structure.