VEHICLE PARKED. STARTED VEHICLE, TOOK IT OUT OF PARK AND IT LUNGED FORWARD CAUSING DAMAGE TO 5TH WHEEL TRAILER, PARK BENCH AND TRUCK STRUCK A TREE. CAUSED DAMAGE TO TIE ROD, BROKEN PITMAN ARM, FRONT BUMPER, HEADLIGHT, POSSIBLE FRAME DAMAGE AS WELL AS DAMAGE TO 5TH WHEEL TRAILER. THIS HAPPENED ON ONE PREVIOUS OCCASION, ABOUT 2 YEARS AGO, I CAN'T REMEMBER THE DATE. VEHICLE ACCELERATED SUDDENLY WHILE BRAKING FOR A STOP LIGHT. VEHICLE WAS IMMEDIATELY TAKEN TO DEALER FOR INSPECTION, BUT THEY FOUND NOTHING WRONG. *NM