[VAC] Source for water tank

[Jerry Jarrell <jdjarrell@xxxxxxxxx>]

Hey James, I have a 57 Overlander without black, grey tanks. I have thought about 
installing a blackwater under the comode in the rear but found only about 4" between 
the floor and the aluminum underbelly. Are the tanks that thin (4") or is the 
underside of my A/S smaller than the older models? Another question for the list - - 
Has anyone used "Natchem" to clean their trailer? My son-in law who is a supertendant 
of a golf course uses it on his equiptment and it works great. Tried some on a small 
spot on my stream and it did great. However, Was wondering if it might be detrimental 
on alcad aluminum? The salesman said it was approved by the gov't for use on Air Force 
planes. Robert Gill, you might know about that aspect of it?
Any help apperciated.
Jerry (and warming up in Middle GA)
57 Overlander WBCCI/VAC