Les,
I wouldn't use Vaseline because of the oil content may react with the plastic/rubber weather stripping. Liquid dish pan soap (Dawn, etc.) seems to work great in installing/removing rubber seals and gaskets ..., plus cleans up easy.
Just a thought.
Bob
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2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)
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