So what did you do to your Truck Camper today?
I saw these threads in some of the other Open Roads RV Forums, but didn't see one for TCs. I'll start... I installed Interior LED puck lights and a 12v power outlet.
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I still bet it is the window. The window is the first thing would check. It does not take much to pull it. It probably has the clay type of caulk, which gets hard and brittle over time and does not seal well. This is especially true with aluminum siding.
