I would have them give You a list of the windows that need to be sealed and do it Yourself. True the way they are sealed when new is a bead of sealant around the window then it is pressed into it but if the old sealant is scraped away and a good silicone is applied and worked into the edge it will be sealed just fine.
The reality is that this resealing is commonplace and I don't know anyone who pulls the windows out and does it that way. Resealing is needed every few years and is part of maintenance.
There will always be air leaks, it's a camper not a submarine.
John
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