2014 GMC SIERRA Structure Problems

WHEN WE TOOK OUR NEW TRUCK FOR A TEST DRIVE WE NOTICED A VIBRATION. THE DEALERSHIP SUPPOSEDLY CHECKED IT OUT AND TOOK CARE OF IT. WHEN TOOK DELIVERY OF THE TRUCK AND DROVE IT HOME THE VIBRATION WAS BETTER AT A SLOWER SPEED BUT INCREASED AS THE SPEED INCREASED. WE RETURNED THE TRUCK TO THE DEALERSHIP AND THEY CHECKED IT OUT AND SAID THAT THEY BALANCED THE TIRES AND ROTATED THE DRIVESHAFT 180 DEGREES. IT SEEM TO BE A LITTLE BETTER. BECAUSE WE TAKE THIS TRUCK TO FLORIDA FOR THE WINTER AND IT IS LOADED MY HUSBAND DECIDED THAT HE WOULD PUT SOME WEIGHT IN THE BACK OF IT TO SEE HOW IT WOULD AFFECT IT. THE VIBRATION WAS BETTER AT A SLOWER SPEED AND WORSE AT A HIGH SPEED ON THE HIGHWAY. THE TRUCK HAS NOW BEEN BACK AT THE DEALERSHIP FOR A WEEK AND WE HAVE NOT HEARD...

TL* THE CONTACT OWNS A 2014 GMC SIERRA. THE CONTACT STATED THAT THE VEHICLE WAS DESIGNED WITH LARGE HOLES IN THE GRILL. WHILE DRIVING VARIOUS SPEEDS, WEEDS WOULD ENTER THE GRILL AND ACCUMULATE NEAR THE RADIATOR. AS A RESULT, THE VEHICLE OVERHEATED. THE DEALER STATED THAT THE VEHICLE WAS DESIGNED IN THAT FASHION. NO REPAIRS WERE MADE AND THE MANUFACTURER WAS NOTIFIED. THE FAILURE MILEAGE WAS 10. UPDATED 8/22/14*CN