Thought I would post a quick follow up now that we are at the end of the season.
Several outings - a couple in varying degrees of rain, being towed at 50-60MPH in a severe thunderstorm and some really heavy storms with the trailer parked at home and no leaks.
It seems that the culprit was the seal around the running light at the top, passenger side of the trailer. I checked it prior to going to the dealer and it looked "ok" - but they scraped it and resealed it.
Side note: we had a blast this season in the X213. Only "complaints" (take that lightly) are lack of outside storage and the bathroom - as a changing room - is a little snug for my 6ft 250lb self. My wife suggested losing weight - I suggested a new truck and a fifth wheel. Pretty sure I lost that one...