On the roof but not the roof issue

[Bob R]

I was doing a little walk around the other day and noticed a piece of black material sticking up on the top rear of my trailer. I climbed up there today and saw what it is. It looks like a piece of plastic trim that sits in a channel to cover screws.

It also seems to have stretched (?).

My plan is to cut the excess length off and lay it back down in the channel and cover it all with silicone.

Does this sound like a viable fix or should I use something else. The edges are sealed with a much thicker beige material. I figure I will have an 8-10 inch run of silicone repair.

TIA

bob