2003 CHEVROLET EXPRESS 2500 Unknown Or Other Problems

I HAVE A 2003 CHEVROLET EXPRESS VAN 2500 THAT THE PAINT JUST STARTED FALLING OFF IN LARGE FLAKES ON THE REAR AND SIDE DOORS, AND THE FRONT HOOD. I HAVE TRIED TOUCH UP PAINT TO TRY AND STOP THE PEELING, BUT IT HAS NOT HELPED.WHEN I WASH THE VEHICLE OR IT RAINS MAKES THE PROBLEM WORSEN BY FILLING UP POCKETS BEHIND THE PAINT. THIS IS A MY COMPANY VAN WHICH HAS DECAL LETTERING ON IT. THE FLAKING IS STARTING TO GET TO THE LETTERING. IF IT CONTINUES, I WILL LOOSE APPROX. $800.00 TO A $1000.00 IN DECAL LETTERING PLUS THE VAN LOOKS TERRIBLE FOR A COMPANY VAN. THE COLOR OF THE VAN IS WHITE. I HAVE NOTICED MANY GM CARS AROUND WHERE I LIVE THAT HAVE THIS PROBLEM. I NEVER REALLY NOTICED UNTIL MY VAN STARTED TO DO IT. MANY OF OUR CITY POLICE CARS WHERE I LIVE ARE WHITE...

UNDER NORMAL USE REAR SIDE DOOR IS HARD TO OPEN OR CLOSE AND NOW BROKEN. THE DOOR, EVEN BEFORE IT WAS BROKE WAS HARD TO LATCH IF IT WOULD LATCH. THIS WOULD MAKE THE FRONT SIDE DOOR NOT CLOSE TIGHT. NOW WITH THE HINGE BROKEN THE DOOR DOES NOT LATCH CORRECTLY. ALL EXPRESS VANS HAVE THIS SAME PROBLEM AND MANUFACTURE KNOWS IT. I TRIED USING EVERY PENETRATING OIL AND IT WOULD NOT KEEP THE DOOR HINGE FROM SEIZING UP. THIS IS A COMPANY VAN AND WE HAVE 2 OF THEM WITH BROKEN HINGES (BOTH ARE THE TOP REAR ON THE SIDE DOOR) AND A 3RD THAT IS VERY HARD TO OPEN CLOSE. IF THIS WERE A PASSENGER TYPE THE DOOR COULD BE HIT ON THE INSIDE AND OPENED BY ACCIDENT. WE ARE IN THE PROCESS OF LOCATING A HINGE TO REPLACE THE ONE ON THE VAN I DRIVE AND WAS...