TRAVELING EAST ON 146N JUST ON THE DOWNHILL SIDE OF THE FRED HARTMAN BRIDGE A GOOD SAMARITAN HAILED OUR ATTENTION THAT THE RIGHT REAR WHEEL WAS ON FIRE OF OUR TRAVEL TRAILER. WE PULLED OVER OUT OF DANGER TO AN ENTRANCE TO A PUBIC BOAT RAMP. THERE WAS A CENTERPOINTE ENERGY PERSONAL THAT HELPED EXTINGUISH THE FIRE TO THE AXLE. THE TIRE AND WHEEL HAD REMOVED ITSELF FROM THE SPINDLE AND ROLLED INTO THE DITCH. CALLING ON AN EMERGENCY ROAD REPAIR SERVICE TO REPAIR THE TRAILER BEARING, IT WAS NOTICED THAT THERE WAS NO BEARING RACE INSTALLED IN THE WHEEL HUB ON THE INBOARD SIDE. THE EMERGENCY ROAD REPAIR TECHNICIAN REPLACED THE BEARINGS RACES AND REPACKED THE BEARINGS TO SPECIFICATIONS TO HAVE US RETURN HOME FOR THE EVENING. WE THEN TOOK THE TRAVEL TRAILER TO A REPAIR SHOP TO HAVE IT PROPERLY REPAIRED AND THE OTHER WHEEL BEARINGS INSPECTED. *TR