I was always taught that if you are going down over water, then one of your last drills was to open the latches, so you would not suffer this problem.
Nobody ever gave me an answer when I asked if you do the same over dry land and every auto to the ground that I have done, the doors have always remained closed.
Personally, over dry land, if it looked like it was going to be a pretty serious bump, then I have always thought that I would open the doors.
C.