2008 CHEVROLET EXPRESS Structurebody Problems

THE SIDE DOORS ON BOTH SIDES VERY HARD TO OPEN BECAUSE YOU CANNOT GREASE THEM, THE SUNROOF LEAKS ,BACK REAR DOORS HANDLES STOP WORKING, TOOK THESE PROBLEMS SEVERAL TIMES TO BE ADDRESS AND PAID FOR SOME OF THE WORK TO BE DONE TO NO AVAIL STILL HAVE THE PROBLEMS, I HAVE A SON THAT'S DISABLE AND ITS VERY DANGEROUS IF SOMETHING HAPPENS AND WE CANNOT GET HIM OUT THE DOORS, PLUS THE SUNROOF LEAKS SO BAD THAT ANYONE IN THE REAR WILL GET SOAK AGAIN PAID TO HAVE IT DONE BUT TO NO AVAIL. CALL GM BUT AGAIN NO HELP JUST WAS TOLD THEY KNEW ABOUT THE PROBLEM AND THAT'S WHY THEY CHANGE THE HINGES THIS YEAR, GRANTED I HAD THIS PROBLEM WITH THE HINGES ON A 2001 CHEVY 1500 EXPRESS BOTH VAN I PURCHASED NEW TO SAY I HAD THESE PROBLEMS WITHIN A FEW WEEKS OR MONTHS AFTER PURCHASE...