This is a common problem and Keystone knows it. Ordering a new door isn't the solution. If they install the bracket in the same manner the screws will just pull out again. There is a thread here on what some of us have done to solve the problem. The latest and greatest idea is to enlarge the inside screw holes with a 1/4" drill (don't go through the outer door!), glue 1/4" dowels, flush with the surface, in the holes, and epoxy the metal bracket to the door. The dowels provide something for the screws to bite into (the existing door surface is very thin fiberglass) and the epoxied bracket provides additional holding power.
Since the Search engine here is such a POS, here are some links that I found.
http://www.montanaowners.com/forums/...ad.php?t=50755
http://www.cedarcreekrvownersclub.co...hp?f=24&t=1708
http://www.montanaowners.com/forums/...ad.php?t=50447