At 141 gallons, the Ronco Plastics B484 is expedition-scale water capacity: a 53 x 35 x 19 inch molding for rigs and vessels that go where the hose bib does not. Off-grid coaches, crew boats, and remote-site trailers are its natural habitat.
It ships from Tustin, California as a dual-role B-series shell. Ordered for fresh water, it is a potable tank in food-grade polyethylene; ordered for waste, it is among the largest gray or black holding tanks in the family. Ronco installs all fittings per order, spin-welded or threaded to the positions you mark, so a tank this large arrives ready to plumb rather than ready to drill.
The load is the design problem: about 1176 lb of water at 8.34 lb per gallon when topped off, on a 135 lb tank. Frame the mount like a fuel tank cradle, not a shelf. Print the dimensioned drawing below, confirm every clearance, then set your ports in the on-page fitting planner.
Ronco has molded tanks since 1974. For scale context, the 100 gallon light-duty RV fresh water tank shows the next tier down, and the RV water range and freight cost estimator round out the decision. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B484 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.
