18' Traveler had one of those galvanized pressurized fresh water tanks in the very front. The fill spout is on the front of the trailer. I took out the heavy, nasty galvanized tank and was wanting to put the new tank under the bed (curbside) at the back of the trailer, just behind the wheel well. In addition, I want to add a grey water tank in the little closet on the other side of the trailer (streetside). The black tank is also going to be on the streetside just toward the rear from the grey tank. Since it is a small trailer, we're not talking huge tanks. The space available for my black tank is: 6" high, x 32" long x 22" wide. The grey tank space would be 10 1/2" wide by 19" long x up to 30" high. The fresh tank can be up to 28" wide x 36" long x 11" high. Another thing is whether or not I can actually find tanks these sizes.
Any words would wisdom would be greatly appreciated.