2015 FORD F-350 SD Suspension Problems

TRAVELING ON A PAVED ROAD. SPEED LIMIT 45 MPH. IT WAS RAINING. NO PUDDLING WAS ENCOUNTERED. I ENTERED A SLIGHT LEFT TURN AND ENCOUNTERED A WASHBOARD TYPE BUMP. IMMEDIATELY, THE FRONT OF THE VEHICLE VIBRATED EXCESSIVELY. I RELEASED THE GAS PEDAL AND PUSHED SLIGHTLY ON THE BRAKES. THE REAR OF THE VEHICLE STARTED TO VIBRATE AND THE REAR AXLE LOST TRACTION ALLOWING THE REAR OF THE VEHICLE TO SWING VIOLENTLY TO THE RIGHT. I IMMEDIATELY WENT TO THE FORD DEALERSHIP WHERE I PURCHASED THE VEHICLE LESS THAN 10 DAYS AGO. SERVICE BROUGHT IT IN AND I EXPLAINED THE ISSUE OF LOSS OF CONTROL AND AN UNSAFE CONDITION. THE SERVICE ADVISOR IMMEDIATELY TOLD ME TO "PUT WEIGHT IN THE BACK OF THE TRUCK. THAT'S NORMAL." I INVOLVED THE SERVICE MANAGER WHO WENT WITH ME OVER THE SAME ROUTE THAT CAUSED THE SAFETY ISSUE. HE SAID, "I SEE WHAT YOU WERE TALKING...