2019 PETERBILT 389 Structurebody Problems

WE PURCHASED THIS TRUCK MARCH 4, 2018. SINCE THAT DATE A TOTAL OF THREE (3) PASSENGER QUARTER FENDERS HAVE "FALLEN OFF" THE TRUCK. THE LAST SET HAD LOCK TIGHT ON THE BOLT. IT IS ONLY INVOLVING THE PASSENGER SIDE. UNSURE IF THE BOLT BROKE OR JUST BACKED OUT. THE LAST ONE WHEN IT CAME OFF HIT OUR PRIMARY AIR LINE AND KINKED IT. LUCKY IT DIDN'T SEVER IT. ALSO WE HAVE HAD THREE (3) "COUNTRY" HORNS VIBRATE INTO PIECES. ALSO THE LAST HORN WAS ATTACHED WITH LOCK TIGHT TO PREVENT THE BUGLES FROM COMING OFF AS DIRECTED BY THE SUPPLIER. ALL THE BUGLES HAVE FALLEN OFF DUE TO THE EXCESSIVE VIBRATIONS OF THIS PARTICULAR MODEL YEAR. NEEDLESS TO SAY WE ARE TIRED OF REPLACING PARTS THAT VIBRATE OR BREAK OFF ON A NEW TRUCK!!!! THE FENDERS GO UNDER OUR DRIVES AND OUT THE BACK. FORTUNATELY NOBODY HAS BEEN INJURED DUE...