1997 DODGE RAM PICKUP Suspension Problems

!)AT 36,246 MILES, BOLTS HOLDING TIE RODS TO STEERING BOX BROKE WHILE I WAS TRAVELING ON INTERSTATE. HAD TO FIGHT DODGE TO COVER UNDER WARRANTY. ORIGINALLY HAD VEHICLE IN FOR 'WANDERING STEERING' BEFORE WARRANTY EXPIRED. THEY REPLACED STEERING BOX, TIE RODS, BALL JOINTS, IDLER ARM AND OTHER RELATED COMPONETS. 2)18,276 MILES LATER, SAME DEALERSHIP STATES NEEDS NEW TIE RODS, IDLER ARM, PITMAN ARM, AND BALL JOINTS ON LEFT FRONT. FEEL THESE PARTS SHOULD BE REPLACED FREE AS THEY REPLACED THEMSELVES ONLY 18,000 MILES AGO. HAVE PROVIDED PROPER MAINTENANCE. IN THE MEANTIME, GETTING THESE AREAS GREASED AND EXAMINED AS DIRECTED IN OWNERS MANUAL BY CERTIFIED MECHANICS. 3)SAME DEALERSHIP THIS WEEK REPLACED HEADER AND MANIFOLD GASKETS STATING THEY WERE BURNED UP DUE TO OUR USING PLATINUM TIP SPARK PLUGS WHICH SUPPOSEDLY CAUSED GASKETS TO BURN UP AND ALLOW OIL TO LEAK INTO CYLINDER. ($459)THEY ALSO HAD TO REPLACE THE CATALYTIC COVERTER (UNDER...