American Tank Co. poly, horizontal leg, transpo tanks with steel forklift base. 325 gal. capacity with 16" top manway. Three available: $450 each, or all three for $1100. Pick up in West Seattle or arrange your own shipping. Only used once, but are not new and have been stored outside on the crush pad. Steel forklift bases ("pallet") have chipped paint & some rust -- cosmetic issue but not functional.
American Tank no longer supplies the base [apparently] but this website describes the other specifications: http://www.watertanks.com/category/12/