So what did you do to your Truck Camper today?

Still trying to figure where a persistant leak is penetrating from on the left rear corner of the TC. Removed the Left rear tail light assembly and removed the putty it was set in and am setting it in QUAD caulk. Also did more caulking in the near areas that could possibly be an entry point. I do have a little wood rot begining so I saturated the area with Wolman end cut preservative for treated lumber decking hoping that will if nothing else, slow down any advance of rot. The affected area is small and for the life of me, cannot figure where the water is getting in there from.
Jeff