How to fix

Take it back to the dealer. That didnt happen in a couple of weeks. It left the dealer like that.

If it was mine I believe the dealer should get their chance to repair this under warranty. If there is a leak later on the warranty could be voided, (this happened to my Cousin and he had to do the repairs himself.)
They should have repaired it prior to you getting the unit.

Take it to the dealer. But, do a close inspection of the TT before you take it back. Maybe you missed something else that needs repaired.

That's a new tt? That is the sloppiest caulking job I have ever seen. Looks terrible. There should also be a rubber cover strip in the track to cover the screws, just like the vertical side piece has. Definitely take it back to the dealer.

It`s just caulk. cut that strip off to where it is still adhered to the trim and get some black Dicor sealant, clean up the area and reapply. you`ll know it will be done properly.

I have a feeling there's a bigger problem under all that goop.

Looks like something they slapped on there while on the lot to cover up something else.

x2
Definitely take it back. It's missing the cover strip and it does look a little fishy how it all was applied in that area and why the strip hanging down.

Taking it back, you will CYA with any further problems if it is documented in the service department. Take pictures, lots of pictures before you take it back in.

IMHO if they give you any flack ask to see the in house service report on that TT. It sure does look like they fixed something there and poorly at that. Good Luck.

Take it back to the dealer under warranty. If there is a deeper problem, that's been covered up, there's a track record started. If you fix it yourself and you discover an underlying problem later, you may void the warranty by doing a self-repair. Best to take it back to the dealer. I can't believe it left their lot looking like that. I agree, that's more than 2 weeks old. Yes, you can fix it yourself, easy fix with new Dicor caulk. But then you won't have the fall back if you discover a bigger issues.

Edit: The more I look at that picture, the more I think that is really a c r a p p y caulking job!

new? or new to you?...no way a NEW trailer should look like that!

Something isn't right here...something is actually really wrong, especially if that is a new trailer.

I agree with others. Get it back to the dealer and it does look like they are trying to cover something up with a very sloppy and hurried repair.