Wow, a couple good reasons how it could have happened. Yes, the shade was down and yes, this was the first trip towing the trailer with new tires. After 2 flats with the original China Pops I replaced them with LT truck tires and they do have an aggressive tread. Next stop, the glass shop. Now if I could just quit getting stuck with the darn thing. It is NOT a 4X4 Truck Camper like I had all my life!! $30K for a 4X4 conversion or $200 for traction panels. Guess which one DW says I can have!!! Thanks guys, this forum rocks!!