WHILE DRIVING ON I-68 WEST BOUND IN THE STATE OF MARYLAND, ABOUT MILE MAKER 67 NOTICE A WOOD BURNING SMELL AND SAW SMOKE IN REAR OF MOTOR HOME. PULLED TO THE SIDE OF ROAD AT EXIT 68. WENT TO REAR OF MOTOR HOME AND SAW FIRE THRU REAR HATCH ON DRIVER SIDE AROUND ENGINE BY EXHAUST. CALLED 911, FIRE DEPARTMENT ARRIVED BUT MOTOR HOME WAS A TOTALLY LOSE. ALSO RECALL WAS DONE ON 08-22-2011, MILEAGE AT RECALL WAS 6125 MILES. MAY RELATE TO NHTSA CAMPAIGN NUMBER 11V416000 COMPONENT ENGINE, ENGINE COOLING AND EXHAUST PIPE. *TR