I think that you need to test your weatherstrip seal... same test as for the fridge ( and for saxophone...)
Close door on a dollar bill and check for resistance pulling the bill out... repeat a hundred times for such a large door.
weatherstrip available at steele rubber products, matching the end profile against the catalog.
fabric store on cave creek just South of Bell Road stocks a selection of common weather strip ( but call first before driving).
on some PW's the manual suggests parking slightly nose up, pooled water from rain or condensate can leak past the AC seals on those models ( includes my lexor)
2006 Pleasure Way Lexor TD on a Chev 3500
Previous: tent strapped to Electra-Glide