2011 INFINITI QX56 Wheels Problems

I PURCHASED THIS VEHICLE FROM A REPUTABLE INFINITY DEALERSHIP ON JANUARY 31,2013 WITH 41,669 MILES,AND I ALSO PURCHASED THE EXTENDED ELITE PROTECTION PROGRAM WARRANTY FOR 5 YEARS FOR $4,978.00.ON MAY 5TH, 2015, I BROUGHT THIS VEHICLE IN FOR A STATE INSPECTION STICKER, WHICH WAS REJECTED BECAUSE MY REAR TIRES WERE WORN OUT BADLY WITH ONLY 15,725 MILES ON THEM.THESE WERE TOP-OF -THE-LINE MICHELIN LTX WITH A WARRANTY OF 70,000 MILES.I BROUGHT THIS SUV INTO THE INFINITY DEALERSHIP WHERE IT WAS PURCHASED AND THEY STATED THAT THE REAR CAMBERS WERE CORRODED AND REAR TOWS WERE FROZEN, AND I HAD TO REPLACE THE COMPLETE REAR SUSPENSION. NONE OF THIS WAS COVERED ON MY ELITE PROTECTION WARRANTY.THE AMOUNT OF CORROSION UNDERNEATH THIS VEHICLE IS ASTOUNDING, IT LOOKS WORSE THAN A 20 YEAR-OLD VEHICLE.THE PRICE OF THIS WORK WAS $2,000.00, ADDITIONALLY MY NEW REAR TIRES WERE $592.80.NOT WHAT I EXPECTED FROM A HIGH-END LUXURY...