[folivier]

Well here's the rest of the story. I drove about 2 hours with the switch in the down position. With sunglasses I didn't notice the warning light. When I stopped I checked my tire temps and they were all ok so don't think I damaged them. Went inside ate a sandwich and walked outside. That's when I noticed the hitch was almost touching the ground. Cranked up the engine, tried to manually level the rear, nothing worked. Called MOT and talked with the service guy "check your tag switch, should be in the middle". Me: "middle? thought it was up or down? never mind".