My 2022 264BH had ZERO caulking around ALL exterior windows. I could see the foam seal and throught that the way it was supposed to be - NOPE. Water leaked during the first rain. Called dealer, he said I could tighten all window fastening screws and apply sealant around all exterior seams for the windows, so I did. Zero issues. Yes, I was drinking when applying sealant, so it looks just like your camper now.
Yes, the slots are water drain holes, do not seal them up.
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