Ralph Cramden wrote:
Looking at the picture thats a sure sign of lack of maintenance.
Either the gutter was full of debris for a long period of time allowing water to lay in that area getting into the snap in trim, or the snap in trim cracked or pulled out of the extrusion. The screws would not rust that much on a 2016 in a few years unless something allowed water to be in constant contact with them.
You can blame Jayco, but thats the same way just about every, if not all manufacturers do a roof termination at the sidewall. The top of the rail appears well sealed to the roof membrane in the picture.
The gutter was and is not full of debris, and even if it was, the screws are a good 1/2" above the gutter. The snap in trim is in fine shape, but its no match for rain driven at 55mph. The problem isn't maintenance, its either poor choice of screws or poor finish. Every screw, on both sides of the RV has a rusty head just like the ones in the example.
