We did not start selling Monaco/HR products until 1998. BUT, I have NEVER seen any Monaco product have such a feature. I also have NEVER seen such a feature on the thousands of motorhomes (multitude of brands) I have worked on over the past 34 years and especially since Slideouts have become standard on almost all motorhomesin the past 25 years.  What makes you believe your HR has such a feature? There is no good reason to have such a feature on a motorhome. If the slideout is extended and you attempt to drive OFF, then you are pretty stupid if you do not see that slideout in your side view mirrors:B I do believe there are a few brands that have such a feature, but I have never seen them. Where is this override switch located and are you positive that a previous owner did not install it?  It does NOT make sense to have such a feature and then have an override switch that negates that feature. Doug