Just read your post....my trailer has the awning windows...I didn't notice that you mentioned which style you have. I have 15 operable windows and not one has a weep slot in the frame. Three of those are exit windows.
That said: I've been chasing a slightly wet floor in one of the rear compartments for two years. The other day I found the culprit. The wiring for the shore line, tail lights and side markers at the rear were concealed behind some thin plywood 'shields'. I pulled one where the water was most likely entering and then for three days of rain I observed. Finally noticed a few drops of water on two of the side marker wires and a tiny puddle had made it's way onto the floor. I pulled everything that enters the side walls under the bottom plane of the windows and cleaned all surfaces with alcohol, left the sealant in place, used LEXEL to reseal the original sealant and after reinstalling, made the top and sides of each item sealed also with the same stuff. I'll do a quick look after the next round of rain, but I don't expect to see any water this time.
I stopped using silicone for much of anything water related 15-20 years ago.