Dougahall,
Since you are on a seasonal site connected to a sewer hookup, I would leave the grey tank valve open, assuming the CG doesn't have any rules against it. Of course the black tank valve you want to keep closed until the tank is full.
I assume that on a seasonal site they require a sealed hose connection at the sewer hook-up (which is good).
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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