Sorry for the delayed reply. Very busy, and limited time to deal with the trailer.
Silicone was used same place MarcS mentioned - at the front of the gutter spout (every one), and even behind the horizontal gutter railing for about 1-2".
The silicone blocked most of the water flow from the gutter spout. So I cut it off, removed most of the "excess", and put Dicor over it all. I KNOW it won't stick for very long (week or two maybe). I only had an hour or two - did the best I could. It'll take hours I'm sure to really clean it up so something else will stick.
Anyway - gutters are now clear, slopped Dicor around a few other areas on the corner that might be suspect. Short but INTENSE rain a couple nights ago. No leaks. Have to keep checking since it might depend on the levelness of the trailer, etc.
But for now - resolved...
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