DEE ZEE DZ92647SB (92 gallon) Black Steel Combo Transfer Tank & Tool Box

I spend a lot of time on the road and at jobsites, so combining a transfer tank with a proper toolbox made sense for my setup. The Dee Zee combo tank promises both in one footprint: a 92-gallon L-shaped steel transfer tank with a bolted-on tool compartment, finished in a black powder coat. After several months of use, here’s how it’s actually performed—good, bad, and the practical details in between.

Build and design

The unit is built from 14-gauge steel with a powder coat finish (Dee Zee’s NRT coating). The structure feels stout. Welds on the seams are consistent on my unit, with clean beads and no spatter left behind. The L-shape is useful in a full-size pickup because it preserves some bed length while giving you the vertical section for the tank and the top section as the toolbox. At 46.75" long, 32.75" wide, and 25.375" high, it’s a sizeable presence, but it doesn’t overwhelm a 6.75' or 8' bed.

As a steel tank, it’s heavy. You’ll want a second set of hands (or a hoist) for installation. The weight works in its favor once installed—there’s very little flex when the tank is full, and the toolbox doesn’t drum or vibrate on washboard roads.

The toolbox lid is supported by gas struts and opens to a moderate angle. It doesn’t go fully vertical on mine. Day to day, that’s fine for hand tools, filters, and fittings, but if you keep taller items inside, you’ll occasionally find yourself angling them out rather than lifting straight up. It’s one of the few ergonomic quirks worth noting.

Capacity and fit

Ninety-two gallons is a lot of liquid. Filled with diesel, you’re adding roughly 630–700 pounds, plus the tank itself. If you’re running a half-ton truck, that’s likely a non-starter; for a three-quarter or one-ton, it’s workable but still requires attention to payload and axle ratings. In my Super Duty, the L-shape nested cleanly up against the cab and left enough room to still carry a pallet and a small compressor behind it.

Plan for rear visibility to change. The 25.375" height sits below the bed rails on most full-size trucks but still creates a visual block in your rearview mirror. Backup cameras and mirrors handle the rest, but you’ll notice the difference the first time you hitch a trailer.

Installation and setup

• Pre-fit: I dry-fit the tank to confirm clearance to the front bed corrugations, stake pockets, and bed lights. The footprint matched the published dimensions.
• Isolation: I added a thin rubber mat under the tank to prevent paint-on-paint abrasion and to help damp vibration.
• Mounting: I through-bolted the tank to the bed using grade 8 hardware and large fender washers/plates under the bed. The mounting flanges are generous enough to give you options. Take your time here—loose or point-loaded mounts are how you end up with stress cracks later.
• Plumbing: This is a transfer tank, not a gravity auxiliary system. I paired it with a 12V diesel transfer pump, filter head, and water-block filter (all purchased separately). I grounded the pump to the truck chassis and the tank itself to minimize static. The bung threads were clean; a couple wraps of fuel-rated thread sealant did the trick.
• Venting: The cap assembly on mine vents as it should. Confirm yours does—any restriction shows up quickly when you’re moving fuel at 10–15 GPM.

If you’re planning to connect to your truck’s main fuel system, make sure you’re using a kit designed for that purpose and stay within local regulations. I use the tank as a standalone transfer source for equipment and the truck when parked, which keeps the plumbing straightforward and compliant.

In use

The combination of capacity and accessibility is the draw. With a full tank, I can run a week on remote sites fueling the truck and a skid-steer without hunting down a station. The pump draws from the front-facing bung cleanly, and the water-separating filter has already caught its share of surprises from bulk deliveries.

The toolbox has become the staging point for fueling gear: hoses, a spare filter, spill pads, nitrile gloves, and a torque wrench. The bolted-on design feels integrated, not an afterthought. The lid seals well enough to keep dust out on gravel roads; after a rainstorm, I’ve found a few faint traces of moisture near the lid seam but no standing water. If you live where it pours sideways, plan to store electronics in a dry bag just to be safe.

Tie-down points are accessible around the tank’s perimeter, which is helpful when you’re still hauling cargo. Just remember to keep straps clear of the pump and fittings.

Durability and finish

The NRT powder coat has taken abuse from straps, hoses, and a couple unintended knocks from a bucket edge. It resists corrosion well where intact. Like any coating, once you scratch to bare steel, you’ve got a clock ticking. I hit chips with a rust-converting primer and black enamel as soon as I notice them; doing that has kept any corrosion at bay. After months in a salty winter, the seams and mounting tabs still look solid.

No leaks so far, and I routinely inspect welds, the cap area, and the bung threads. A big factor here is installation: solid, evenly distributed mounts minimize flex and stress risers. I also keep the tank at least a third full to reduce slosh on rough roads.

Ergonomics and security

The lid opening angle is the main ergonomic gripe. It’s not a deal-breaker, but a larger opening would make it easier to bin and retrieve tall aerosol cans or a cordless impact standing upright. The struts close the lid smoothly and hold it up reliably; even in cold weather they’ve maintained enough force.

Hardware quality on hinges and latches is good. The lid shuts with a firm press and hasn’t rattled loose. The black finish keeps a low profile in the bed and doesn’t reflect glare into the cab rear window.

Safety and compliance notes

• Use it for the fuels it’s rated for, and follow your local and federal regulations. Transfer tanks are often designated for diesel; gasoline has different rules and venting requirements.
• Ground the system, use fuel-rated hoses and seals, and add filtration. Water and particulates are cheap to filter and expensive to repair.
• Mind weight and payload. Ninety-two gallons plus steel adds up quickly, and your stopping distances and rear axle loads will change.

What I’d change

• A wider lid opening angle or adjustable strut geometry would make the toolbox more usable for tall items.
• Include isolator pads or a mounting template. Many failures in the field come from poor mounting; a few guided options would help DIY installs.
• Packaging could be beefier. Mine arrived with only a minor scuff, but the protection is mostly cardboard and corner guards. A heavier-duty crate would better match the product’s weight.

Who it’s for

• Contractors, ranchers, and anyone fueling multiple machines on site who needs both storage and a sizeable diesel reservoir.
• Three-quarter-ton and one-ton truck owners who can spare the payload and bed space.
• Users who prefer steel’s rigidity and repairability over aluminum’s lighter weight.

If you need a lighter setup or you’re working in a salty coastal environment with minimal maintenance time, an aluminum tank-toolbox combo might be a better fit. You’ll sacrifice some dent resistance but gain weight savings and added corrosion resistance.

The bottom line

The Dee Zee combo tank does what it says on the tin: it gives you real storage and real range in one footprint. The steel construction feels robust, the finish protects well, and the 92-gallon capacity changes what a truck can do between fuel stops. The trade-offs are weight and a toolbox lid that doesn’t open as wide as I’d like. Install it carefully, keep the coating touched up, and it’s a dependable piece of kit.

Recommendation: I recommend it for diesel users who need high capacity and integrated storage on a three-quarter-ton or larger truck. It’s a practical, durable solution with a couple of ergonomic and shipping caveats, but in daily use it has earned its place in my bed. If you’re payload-limited or set on a wide-opening lid, consider alternatives—but for most jobsite and ranch scenarios, this one delivers.