1997 JAYCO DESIGNER Structureframe And Members Problems

THE 6" CHANNEL WELDED ACROSS THE FRONT OF THE FIFTH WHEEL PIN BOX BROKE IN HALF CAUSING THE TRAILER TO DROP.THIS IS THE POINT OF ATTACHMENT OF THE FIFTH WHEEL TO THE TOW VEHICLE. THE CHANNEL SUPPORTS THE FRONT PART OF THE KING PIN BOX. ON REMOVAL OF THE SHEET METAL UNDER THE GOOSENECK PART OF THE TRAILER IT EXPOSED THE CHANNEL BROKE INTO ON THE RIGHT SIDE OF THE PIN BOX, THE METAL ON THE LEFT SIDE RIPPED OPEN, THE BACK OF THE PIN BOX ATTACHMENT BROKE LOOSE AND METAL RIPPED OUT. ONE WELD WAS BROKEN. I HAVE BEEN INTOUCH WITH JAYCO BUT THEY SAY IT IS NOT THEIR PROBLEM. THEY SAY THAT THIS UNIT IS 13 YEARS OLD AND I WILL HAVE TO REPAIR. THE PROBLEM IS THAT THE METAL USED FOR THIS MAJOR STRESS POINT IS TO THIN AND INFERIOR. THE CONTINUED FLEXING OF THESE COMPONENTS CAUSE...