I have a 2016 3200. Fresh tank is 160 gal, gray is 75 (there are two tanks but the manufacturer does not list the volume for each and black is 45.
As for the fresh tank, I use a meter to monitor how many gallons I put in. I have not been able to put in more than 132 gal; this plus the 10 gal hot water tank brings me to 142. Close enough but always wonder why not the full 160.
I have been camping for two weeks (wife and me) with only water and power. I have yet to have the pleasure of using cousin Eddie's phrase of "****ter's full".
Fuel tanks are 30 ga each rear tank is generator, front tank is pump station.
Move forward and you have galley grey water tank.
Move forward and you have two fresh water tanks.
Under the basement you have the bathroom waste tanks curbside is black water tank, drivers side is grey water tank. Sizes I don't recall. I am on the road. When I get home I'll post the mechanical drawing.
2017 Dodge Ram 3500 DRW
2014 Voltage 3200
So according to my 2013 Voltage 3200 manual my tank holds 162 Gals fresh,
48 gallons black, 78 gallons bath gray tank, and kitchen is unknown but smaller as it is always first one to fill up.
Heater #1 heats Black water tank
Heater #2 heats Gray water bath
Heater #3 heats Gray water Kitchen
Also have discovered that on my unit, when the electric water pump loses suction I can in a pinch go out and put a bucket under the fresh water main drain T-handle valve and still get almost 30 gallons of water out. Geez, why put the pump in the bottom of the fresh water tank so it could get "all" of the water out?
And of course with the wonderful idiot lights on the interior panel it will say that I have no water remaining. When the tank is full to overflowing out of the water fill tube, it will only indicate 1/3 of a tank.