I WAS TRAVELING UP HORSESHOE BEND (IDAHO). I HEARD A NOISE THAT SOUNDED LIKE A BACKFIRE, BUT TOWARDS THE FRONT. AFTER I HEARD THE NOISE, THERE WAS SMOKE COMING FROM UNDER THE HOOD. MY PASSENGER AND I WERE ABLE TO MAKE IT OUT OF THE VEHICLE. WHEN I OPENED THE HOOD, FLAMES JUST EXPLODED FROM UNDER THE HOOD. IN JUST A MATTER OF MINUTES, MY TRUCK AND 5TH WHEEL WERE ENGULFED IN FLAMES. THE PASSENGER AND I WERE TREATED IN FIRST RESPONDER VEHICLE FOR SMOKE INHALATION.