Eighty gallons is boondocking currency. It is the difference between a weekend off-grid and a week, between rationing dishwater and living normally while the nearest hookup is a county away. The B230 banks that capacity in a long, low RV fresh water molding - 68.5 x 27 x 11 inches - built to ride between the frame rails where coach builders hide their heaviest consumable.
The proportions do the structural work. Full, this tank holds about 667 lb of water (8.34 lb per gallon), and the 68.5 x 27 inch footprint spreads that load across multiple crossmembers instead of parking it on one. Support the full length, strap to frame, and the chassis will not notice what the tank is carrying. The molding itself is FDA-compliant polyethylene, potable-rated, rotomolded seamless; it ships at 120 lb, so stage the install with two people and run the freight cost estimator for the lane to your ZIP.
Fittings are installed per order in Tustin, California, as Ronco has done since 1974. Across nearly six feet of tank, where the fill, vent, pickup, and sender land is a plumbing-design decision - print the drawing below and mark each location, or place them on the on-page fitting planner, and the shop spin-welds or thread-installs to your marks.
Compare long-body fresh moldings like the 83 gallon RV70W in the RV water tank category, or browse the whole line on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B230 dimensional drawing - print it to plan your install and mark exactly where you want fittings located; Ronco installs spin-weld or threaded fittings to your marked spec.