Well, we just re-installed one of those seals. not as hard as it seemed at first. we'll caulk it tomorrow. too late and too many mosquitoes tonight. of course, we took care of the easiest one first -- at eye level under the bedroom slider. We're heading off on a trip in a few days. Replacing these things may give us something to do while we're not doing something else.
We just put the square-drive screwdriver, some caulk and the razor blade scraper in the trailer. At least now we know it's a doable project and not something we have to take back to the dealer for warranty work (losing the trailer for who knows how long?). Thanks for all the advice. it has really helped.