In my opinion, the best in the RV windshield business is Duncan Systems in Elkhart, IN. They were recently bought out by Lippert but they are still the same people and shops. I, too, was having troubles and getting conflicting answers about sealing in tight vs "floating" in the rubber gasket. Bottom line, their glass guys do this all day every day and know what they're doing. The end result on mine was that it needed to be sealed in tight and have had no problem since.
