Rattle in Door

I have a rattle in the drivers side door it seems to make the most noise when going over 45 mph. It drives my husband nuts he just hasn't had time to figure out what the problem is because he is in the navy. Any help I would be thankful for so he can fix it next time he is home or I can even try I can do most repairs to the truck.

mine was the window regulator bolts . they came loose.