TrailManor Specifications Water/black water/gray water?

I just came back from visiting the TrailManor Web Site and they do not specify the size of the fresh water tank or the Black water tank. They do specify gray water tank as 30 gallons. Is this a big secret or did they overlook basics? Would like to know the size of these tanks as it affects the weight of the trailer. Sometimes I have had to travel with tanks that could not be drained at the campground. I have the brochure and it has almost no information on specifications. Appreciate any information on 2720 SL or SD.
Thanks