A crash north of Osage Beach shortly after the morning rush hour Thursday sent a St. Charles couple to a local hospital and closed Highway 54 in both directions for a time.  The Missouri State Highway Patrol says that 70-year-old Charles Nunn and his 66-year-old wife, Carol, were in their Chevy truck towing a dump trailer at the time.  The left rear tire on the trailer blew and Mr. Nunn lost control, ran off the road and hit a guard rail.  Both were taken to Lake Regional Hospital in Osage Beach with minor injuries.