Go to a truck/ trailer shop ( peterbilt etc), get this or similar. On all the OTR trucks and trailers out there. Not water tight but seems to do the job.
https://www.amazon.com/Terminal-Junc.../dp/B007480MI6
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Brent W
2019 Duramax dually
2015 Fuzion 325
2008 Goldwing
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