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Hi my name is Robert...
IF you can send a few pictures it will really help out, should be able to add some into your reply...
Thanks for the pictures...
What I would do for this is get the area cleaned really good, adhesive cleaner works well. After it is cleaned get some tape and tape of on the side wall about 1/4" and do the same on the molding. Get some Dicor sealant, most RV stores will carry it. Add the sealant so it goes in the void and then smooth it out so it goes onto the tape, once the sealant is on and you have no voids pull the tape and you should have nice uniform lines. Once the Dicor sets up it should hold that together and keep any water out..... Robert
NO to fill that gap would cost maybe 30 dollars if you did it and 130 if a shop did it, they will charge about 1 hour of labor.
It looks like you might need at least two tubes maybe three for the Dicor, it will go in a caulking gun... Robert