Yea those tops were designed to hold water, funny though most of us think they were designed to repell water, NOT SO!!!!!!!!!! My covers hold water sooo well when rolled up off the truck too, this design feature is one that the Military really excelled at...
I think it may be human error to be honest in the way they are put on your truck. not an actuall design to hold water, but Hey.... A properly secured top does repell all water, many units over the years have either like said above put a board or 2, but much more prevalent was a row of ply wood down the middle of the bows, for snow load more than anyother reason, as it has been done in southern climates, in the northern ones it is much more in use, It only makes sense that a top that is equal in lenght and width and folded the same on all sides would hold the same amount of water, i would have guessed that, But like i said , it is the way u folded them. Good luck !!!..Oh and even though we see what U are talking about, it is thought ful to mention the top bows that have had guys do things to them to repell water, but also again , a properly secured top will have no problem unless it is sticky snow.