THE PILOT MISJUDGED THE CLEARANCE BETWEEN HIS AIRCRAFT AND A FENCE DURING A TAXI TO A RAMP AREA AFTER LANDING AT BULLHEAD CITY, ARIZONA. AFTER COLLIDING WITH THE FENCE, THE AIRCRAFT COLLIDED WITH A PARKED VEHICLE. WITNESSES STATED THE AIRCRAFT WAS TAXIING TOO FAST FOR THE AREA. THERE WERE NO MECHANICAL PROBLEMS FOUND WITH THE AIRCRAFT.