Window seals can be a few different kinds of material. I have seen butyl tape, rubber strip, and what looks like foam strips.
Its common for some manufacturers to use silicone sealant on the top and sides, but not the bottom. If your not experiencing any leaks you might want to leave it alone.
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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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