The Truck Camper had a chronic window frame leak

When I finally pulled the window on my Bigfoot, I found that it was sitting in the lower rear corner of an oversized hole in the wall. This left very little of the flange in contact at the upper front corner, and no amount of caulk was ever going to fix it. With a few wooden spacers, I was able to get the window centered with flange coverage all the way around. Like the others that have suggested it, I recommend pulling the window and re-taping.