Get a car cover for the trip. While you are driving very little water gets to the rear window, even in rain. At least as long as you are moving. The trouble is when the car is sitting. I would also seal the window from the inside with duct tape.
If water does get in through the window it will make its way to the floor in the cabin.
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2004 Boxster S Silver - FUNTOY
2002 Boxster Base Guardsy Red - FUNBOX
1987 Caterham Super 7 1700 Supersprint
2009 Mercedes Benz CLK 350 convertible
1941 Dodge Luxury Liner Coupe
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