when you pulled the rubber strip off the gutter rail,did you check to see that all the screws were tight ? the leak i had on my rockwood ultimately was found to be wicking into the screw holes behind the gutter rail.when I checked the screws,i could almost tighten them a full turn. water seeped across the ceiling and actually dripped out of the A/C vents in the middle of the ceiling as well as running down inside the walls leaking out of the window and door frames. solution,removed all the screws in the rail on both sides of the trailer and replaced with SS screws dipped in Dicor caulk. I made sure that each screw was totally snugged when I put them back in....result,stopped the leaks completely !