[commodor47]

Tony,

Those are great photos and do indicate areas of possible water infiltration. That trim piece is similar to pieces found on my unit - specifically along the front shell leading roof edge, on all four corners of the main box and around the outside storage doors. The center strip is a vinyl material used in many RV models. It should be readily available from most RV dealers. The ends of the vinyl strip is folded under on itself and can be tricky to remove. Applying heat (maybe a hair dryer) should soften the vinyl and make undoing the folded end a bit easier. Your assumption of hidden screws is correct. I would suggest you concentrate on the replacing the old caulk first. If that stops the leak(s) there is probably no need to remove the vinyl strip(s). It might be a good idea to replace the caulk along the center of each shell roof and around any skylights.

Dick