I had the tank built to fit between the trailer frames. It measures 19.5" x 35.5" x 4.75" with a capacity of 11 gallons. Installed,it hangs below the trailer frame 2". I used 1/8" x 2" aluminum to fabricate the support straps

There is just enough room to allow for the bladder and Shurflo pump.

I had 3 FPT threaded holes placed in the tank. One for an inlet line, an outlet line, & a vent line.

Installed Water Tank