THE INCIDENT TOOK PLACE ON AN EXIT ON INTERSTATE (I-610 LOOP SOUTH IN HOUSTON). MY SON CAME TO A STOP WHEN CAR IN FRONT STOPPED ABRUPTLY. THIS IS WHEN MY SON WAS REAR ENDED BY 2016 F-250 THAT WAS TOWING HORSE TRAILER. THIS PUSHED MY SON'S TRUCK INTO THE CAR IN FRONT. IMPACT COMPLETELY BUCKLED MY SON'S TRUCK BED AND DAMAGED THE FRONT AND THE INSIDE CABIN. BOTH THE FRONT SEATS BROKE (BACK RECLINING PORTION SNAPPED BACKWARD) PLUS NEITHER AIRBAGS INFLATED FROM THE IMPACT. SO MY QUESTION IS WHY WOULD THE FRONT SEATS SNAP BACKWARDS (IS IT DESIGN FLAW?) AND WHY DIDN'T THE AIRBAGS INFLATE FROM THE IMPACT TO THE CAR IN FRONT? FROM THE DAMAGE TO ALL THE VEHICLES INVOLVED YOU CAN SEE THAT IT WAS A VERY HARD IMPACT.