I reviewed the owner's manual and it says that the tank capacity for the gray and black are roughly 38 gallons each. The interesting thing is that the panel says:
Fresh Water Tank.......1/2
Gray Waste Tank 1......3/4
Gray Waste Tank 2......E
Black Waste Tank 1.....1/2
Black Waste Tank 2.....E
Propane................Full
Only the first Gray and first Black lines register a level other than "E". So I will e-mail my dealer and ask them about the panel readings. I should have read the manual before I posted so that I knew that I have only one tank (roughly 38 gallons) for each type of waste.
Thanks for the responses!!