We didn't have any water dripping from our king pin but have once had water evidently in the underside of the overhang area. When we raised the trailer nose to hook up to the TV after a heavy rain, water came out of the seams along the back and sides of the overhang area. I then pushed up on the underside of the overhang and more water came out. I believe it is due to faulty caulking along the top of the seam where the nose cap meets the side walls, but haven't yet confirmed it.
I've also noticed inside the RV that the staples along the inside panel have started to rust in the same curve area around the headboard (so far, just on the curb side)...but at about the same spot where this outside seam is located.
I'd recommend checking the caulk around this area.