You are only 10" longer then me and if yours is the same as mine, you only have 3 tanks despite the control panel showing 2 black and 2 grey. FR seems to use a generic panel for a lot of their models.
I have the same as you, right in front of the tires in the kitchen drain for the grey water and then I have 1 black and 1 grey in the side compartment.
Although I know many don't, I keep both grey and black closed until they get close to full. I don't like the idea of food particles possibly settling in the bottom of the grey tank with the drain valve always open. I work it like the black, keep it closed and then open when it gets close to full so everything is rushed out at once.
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2015 F350 6.7 Platinum
2015 Coachmen 360IBL
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