I have a 2007 3000RK
Yours will be slightly different by year
On the 2007 shower on passenger side..
there is a traditional trap
Below the shower pan in the basement
That then runs forward catches the vanity drain
Its along the top of compartment near the heater duct.
Then turns down to the tank at the forward side of the compartment.
There is a vertical pipe above the vanity that is the roof.vent
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