I've got a small leak on my rear window that runs down the bug screen. When I wash the Airstream it doesn't occur so I'm thinking it takes some time to see the run. I'm thinking it's not the window but maybe higher up too. If there are clearance lights above that could be a source or a rivet. Capt Tolleys for the rivets and Parbond around the clearance light housings. If it still leaks maybe a pressure test will reveal the source.
2008 Classic 25fb "Silver Mistress"
2015 Ram 2500 6.7L Cummins. Crew Cab, 4x4, Silver
2010 Tundra 5.7L, Double Cab, 2wd, White