Driving through the parking lot with my Swinger I rolled through a storm drain that must have a 1 1/2' deep hole. Damn, right side dove in and the rear tires squawked when they came back to earth. I didn't see any damage but I didn't drive it much after that. I might go back later and drive it around to make sure everything is ok. (and take some photos) All they need to do is fill it full of rock.