Winnebago has used the Kwikee Level Best system. When mine went bad I got a new one from Winnebago through Lichtsinn Motors, a Winnebago dealer a couple of miles from the factory. It was expensive - over $400 as I recall.
Clay WA5NMR - Ex Snowbird - 1 year, Ex Full timer for 11 years - 2004 Winnebago Sightseer 35N Workhorse chassis. Honda Accord toad.