I called FR today and discussed some items with them. The guy I talked to was very helpful and friendly. He returned my call within about 2 hours and my email before the end of the day, I was pleasingly surprised. He answered some questions i had on my tanks and tire info ratings. He also mentioned that FR produces so many models it is hard to make an individual manual for each rv with all drawings etc. He explained that even the dealers dont have the info we often ask for.
He confirmed i have grey capacity of about 66 gallon, he suspects I have two 33 gallon tanks, one for kitchen sink, one for bathroom shower/sink.
Have a great time camping