I've been to the track site at St. George twice. There are some very well preserved tracks and it appears to have been a site that the dino's visited often since there are multiple layers of impressions suggesting yearly visits.... or migrations perhaps?
Of the 100s of footprints ranging, which range in size from several inches to about 18 inches... there were only two spots which might be tail drag. They appear on one trackway cluster (many foot imprints of multiple animals) and within approx 8 feet of each other. Maybe one animal with a broken tail or injured leg?
Worth a visit if you're in the area.