The Enduraplas 400 Gallon Plastic Horizontal Leg Tank (SKU THF00400BK) is a cylinder-on-its-side tank with molded support legs, built to sit low and stable on a skid, trailer, or truck bed for hauling and transferring liquid in the field. It holds 400 gallons and measures 74 inches long by 46 inches wide by 37 inches tall, so it occupies a 46 by 74 inch footprint - dimensions worth checking against your trailer deck or bed rails before you order. The low horizontal profile keeps the center of gravity down, which is the main reason applicators and haulers reach for a leg tank instead of a standing vertical when the tank has to move. If you are comparing plastic horizontal leg tanks or applicator transport tanks for a farm fleet, this 400-gallon size sits in the range most field haulers shop.
Will it work for your setup
Verified dimensions on this unit are 37 in height, 46 in width, and 74 in length, and the technical drawing on this page shows the leg spacing and overall geometry you will want to confirm against your mounting frame. Sizing matters most when the tank is full: 400 gallons of water weighs about 3,336 pounds, and that load rides on the legs and whatever structure carries them. Spread across the 46 by 74 inch footprint, that is roughly one pound per square inch of average deck load - a useful number to match against your trailer rating - but plan your axle capacity, tie-downs, and support around the full weight, not the empty tank. Because this is a cylinder lying on its side, fill volume is nonlinear: at a half load of about 200 gallons the tank carries roughly 1,668 pounds, but the liquid depth is NOT half the tank height, so do not gauge partial loads by eye. If you are still deciding on capacity for your route, run the numbers through our Tank Sizing Calculator and the Tank Sizing Guide before committing.
Match the tank to the liquid
The specific-gravity rating for this model is not published in our data, so before you fill it with anything heavier than water (SG 1.0) call us at 866-418-1777 and we will confirm the rating for your application. Fitting and outlet details are not something to guess at either - confirm the port sizes against the drawing before you plumb the tank. A few resources are worth reading if your load involves a fertilizer blend or DOT-scoped transport: our guide on fertilizer-blend tank stratification and mixing protocol covers how density-driven layering can send a spreader off-spec, and the breakdowns of applicator and leg tanks under the Non-Roadable Trailer scope and the 49 CFR 173.5 agricultural exemption are useful before you put a tank on the road.
Freight and next steps
This 400 gallon horizontal leg tank ships LTL freight, quoted live to your ZIP - get your number in seconds with the Freight Cost Estimator, or call us at 866-418-1777 and we will size the tank, the mount, and the shipment to your rig. Give us the deck dimensions and the full-water weight above, and we will make sure the leg tank you order fits the trailer it is going to live on.
