Which window? I think the screws that hold any window in are on the interior. Rust would be from condensation. There are weep holes on the bottom frame to allow excess moisture to drain. Some factories will use silicone on the OUTSIDE top and side edges, some use ProSeal.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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