The Enduraplas 3500 Gallon Plastic Horizontal Leg Tank (SKU THF03500BK, black per the BK suffix) is a haul-and-transport tank: a cylinder mounted on its side with molded support legs so it sits flat on a trailer deck or skid without a separate cradle. It holds 3,500 gallons and stands 70 inches tall, which on a horizontal cylinder is also the tank diameter, with a body roughly 179 inches long. The technical drawing on this page shows the leg spacing and cap geometry, so confirm the length and leg centers against your trailer frame before you order.
Will it work for your setup
This is a horizontal leg tank, meant to be filled, hauled, and drained rather than stood up as a stationary vertical vessel. Size your load around a full-water weight of 29,190 pounds at 3,500 gallons of plain water. That figure drives two decisions: your trailer's axle rating and tie-down capacity have to carry it, and anything denser than water pushes the effective weight higher still. For deck width, plan around the roughly 70-inch tank diameter rather than the overall length. Run your exact volume and liquid through the Tank Sizing Calculator, and if you are matching a tank to a job, start with the Tank Sizing Guide.
The mistake to avoid
The weight math catches people. A liquid heavier than water loads both the tank wall and the trailer past any plain-water plan, and this SKU's specific gravity rating is not published in our current spec data. Before you haul anything over 1.0 SG, such as a fertilizer blend or UAN, call 866-418-1777 and we will confirm the wall rating for your liquid and whether a higher-SG version is available. On the same call, confirm the drain outlet and fill-lid sizes: bulkhead, valve, and fitting dimensions for this tank are not loaded in our spec sheet, so verify them with us before you buy any hardware or gaskets rather than ordering against a guess.
Field notes for ag hauling
If you are running a fertilizer blend, thermal layering and density-driven salting-out can change what the tank actually carries load to load, which affects both mix quality and effective weight: see Fertilizer-Blend Tank Stratification. And when this tank rides a trailer on the road, the DOT classification questions are covered in our guide on the DOT Non-Roadable Trailer (NRT) scope.
At roughly 179 inches long this tank ships by LTL freight, not parcel. Pull a live rate to your ZIP with the Freight Cost Estimator, or call 866-418-1777 and we will quote the run to your delivery address and confirm the shipping plant for your order. Get the freight number before you commit so there are no surprises on a tank this size.
