I know some of you have probably experienced so let me know what you think. I was getting the RV ready to go on a trip and was attempting to move the Reese Revolution Sidewinder pin box to center. Of course it wouldn't move so I began to push and let go several times and each time I could hear something moving inside the cap. Is it possible it could be water? I just had the roof inspected and sealed/reconditioned at my dealer. Tell me what you think. I'm going on the trip anyway and will get it looked at when I return. Have plenty of payload on my 2016 350 so if it is water the wt. won't hurt. Is it possible to drill a couple of holes in the bottom to drain it and then tape over or use rubber plugs.