Thanks to all. If mine were directly under the toilet and the shower and where the fresh water fill is then mine are ALL behind the trailer axles!! Making for a really light tongue unless I kept all three tanks pretty much empty. I guess I will have to take the covering on the underbelly to see where they actually are.
I sure wish Forest River would make available better manuals or at least make their website such that we could look up this information.
Oh well
Paul B