[twindman]

Also, are you sure the manual says 88 gal. tank? All the specs I see when searching have something like: Waste water 49 gal then gray water 88 gal. These are not tanks, I don't think. For the last 13 years they have always had 2 gray tanks. In this case they would total 88 gal. An 88 gal. tank would weigh around 650 lb. I am not sure there is support for this in one tank.

An 88 gal tank just seems incorrect - tho I have been wrong once or twice in my life!!!!