I think the main problem with the water in the over head bunk area is not solved by going to a rig with out a bunk and windows. The main problems I have seen over the years seem to be the running lights and roof seam. Some are the window but I think the roof seam above the window and running lights are the problem most often and the windows get the blame. You still have the running lights and most have a roof seam with out the bunk area (even the one piece front caps) and they are leaking into a closed area. Do not think the problem has gone away just harder to see and get to.