It’s 05:00 AM on a Tuesday in November, and the frost is thick enough on the job site that you could skate on it. I’m standing next to an excavator that’s bone dry and a crew that’s waiting on me to get the iron moving. In the old days, that meant wrestling five-gallon plastic cans out of the bed, spilling half the fuel on my boots, and wasting an hour of daylight just to get through the morning. If you’ve ever been there, you know that’s no way to run a business. You’re not just moving fuel; you’re moving money, and every drop on the ground or minute spent at a gas station pump with a line behind you is a leak in your profit margin.
That’s why a real transfer tank isn’t a luxury—it’s a piece of heavy equipment in its own right. I’ve spent the last twenty years bolting these things into the beds of everything from beat-up half-tons to brand-new duallys. I’ve seen cheap tanks split their seams the first time they hit a washboard road with a full load, and I’ve seen 'heavy duty' steel tanks turn into rusted-out boxes of orange flakes after two seasons of salt and slush. You need something that can handle the vibration of a diesel engine, the weight of a full load shifting at 60 MPH, and the legal headaches that come with hauling combustible liquids on public roads.
Today, we’re looking at the big leagues. We’re putting the gear through the ringer to see what actually holds up when the tailgates drop and the work begins. We aren't just talking about capacity; we’re talking about weld quality, baffle design, and whether or not the DOT is going to breathe down your neck for what you’ve got in the back of your rig.
What We're Testing
A transfer tank is a simple concept—a box for fuel—but the execution is where the rookies get separated from the pros. For this evaluation, we’re focusing on the ATI 62 Gallon Black Rectangle Transfer Tank. This isn't just an auxiliary tank that feeds your truck's engine; this is a refueling station designed to fill your skid steers, generators, and tractors right where they sit.
My testing process is simple: we mount it, we load it, and we abuse it. I looked at the mounting bracket integrity—because 62 gallons of diesel weighs roughly 430 pounds, and that’s a lot of mass trying to rip itself out of your truck bed when you hit a pothole. We evaluated the 'vent/prevent' cap system to see how it handles pressure build-up in the summer heat and vacuum in the winter cold. Most importantly, I checked the internal baffles. If a tank isn't properly baffled, that fuel sloshes like a tidal wave every time you brake, which beats the hell out of the welds and can actually push your truck around in the corners. We also looked at the 'Legal' factor—specifically the DOT permit that allows this particular ATI model to carry more than just diesel.
The Competition
There’s no shortage of outfits trying to sell you a fuel box, but only a few names are worth the powder to blow them up.
First up, you’ve got the Weather Guard models, like the 352-5-02. Weather Guard is the gold standard for many, and their steel tanks are built like bank vaults. They use 14-gauge and 12-gauge steel in high-stress areas and finish them with their 'Armor Tuf' powder coat. They are incredibly durable, but they are heavy—expect the tank alone to weigh nearly 200 pounds empty. If you’re already pushing your payload limits, that’s a lot of dead weight to carry around. They generally carry a limited lifetime warranty, but they sit at a higher price point, often over $1,300.
Then there’s Dee Zee. Their rectangle tanks, like the DZ91752X, are popular for guys on a budget. They use .125" Brite-Tread aluminum and a radius-curve design to eliminate some weld pressure points. They are decent tanks, and the 39-gallon narrow models are great for preserving bed space. However, in my experience, they are a bit more 'consumer grade.' They’re fine for the occasional refuel on a farm, but for daily commercial abuse, I’ve seen the hardware struggle over time. You can usually pick these up for around $800 to $950.
UWS is another heavy hitter, especially their L-shaped and rectangle aluminum tanks made in Florida. Their TT-75-L is a solid 75-gallon option made of .125" aluminum with a decent baffle system. They are reliable and well-priced (around $900), but they are primarily rated for diesel only.
EDITOR'S PICK: After looking at the field, the ATI 62 Gallon Black Rectangle Transfer Tank takes the top spot. Why? One word: Versatility. Most aluminum transfer tanks on the market are strictly for diesel. ATI holds a special DOT permit that makes this tank legal for gasoline, methanol, kerosene, and aviation fuel too. If you’re a contractor running a diesel truck but you need to fill up gas-powered saws, mowers, or a separate crew truck, this is the only tank that lets you do it legally and safely without switching to a heavy steel setup.
| Product | Capacity | Material | Price Range | Key Advantage |
|---|---|---|---|---|
| ATI 62 Gallon Rectangle | 62 Gal | .125" Aluminum | $1,075.99 | DOT Permit for Gas & Diesel |
| Weather Guard 352-5-02 | 75 Gal | 14-ga Steel | $1,350 - $1,450 | Extreme Durability/Steel |
| Dee Zee DZ91752X | 39 Gal | .125" Aluminum | $830 - $940 | Compact/Narrow Footprint |
| UWS TT-75-L | 75 Gal | .125" Aluminum | $850 - $950 | Value-Priced Aluminum |
Installation & Fit
Installing a transfer tank isn’t a 'five-minute job' if you want to do it right. The ATI TTR65-BLK has a footprint of roughly 54 inches at the bottom (tapered from a 60-inch top). You’re going to need a solid hour, a buddy, and a heavy-duty drill.
Mike’s Pro Tip: Before you start drilling into that bed, crawl under the truck. I can’t tell you how many rookies I’ve seen put a 7/16" bit right through a wiring harness or, god forbid, the truck's primary fuel line. You need to map out where those mounting brackets sit relative to the frame rails and under-bed components.
Tools you’ll need:
- Tape measure and a marking pen.
- Power drill with a 7/16" or 1/2" bit (cobalt bits are your friend here).
- Two 9/16" ratchets or a ratchet and a box-end wrench.
- Grade 8 mounting hardware (ATI includes brackets, but always double-check your bolt length for your specific bed thickness).
When you mount this, make sure it’s centered. An off-center tank with 62 gallons of fuel will make your truck track like a wounded dog. Also, remember that the fill neck and the pump you’re going to buy (I recommend a 15 GPM Fill-Rite or GPI) will add height. If you have a tonneau cover or a low-profile rack, measure three times. The tank itself is 13 inches high, but the cap adds another 2.5 inches. Don't find that out the hard way after you've already bolted it down.
Long-Term Durability
I’ve been running ATI gear for years, and they hold up because of how they’re put together. The .125" aluminum is thick enough to resist dings from tools sliding around the bed, and unlike steel, it’s never going to rust from the inside out.
One thing you have to watch for in any transfer tank is 'weld fatigue.' Aluminum is lighter than steel, but it’s also more rigid. If the tank isn't baffled correctly, the constant 'slap' of the fuel against the walls will eventually spider-crack the corners. ATI uses fully welded internal baffles that not only stop the slosh but actually act as internal structural ribs.
Over a full season of road salt and job site mud, that black powder coat on the ATI has held up better than the mill-finish aluminum you see on cheaper tanks. However, watch the 'bung' areas. That’s where you screw in your pump and your vent cap. If you don’t use a high-quality thread sealant (like a fuel-rated PTFE), you’ll get 'weeping'—that annoying oily film that attracts every piece of dust in the county. Keep it clean, keep the bolts tight, and this tank will likely outlast the truck it's sitting in.
Pros & Cons
Pros
- DOT Legal for Gas: The special permit is a massive win for mixed-fleet contractors.
- Lightweight Strength: At 102 lbs empty, it won't kill your fuel economy or eat up your payload capacity like steel.
- Low Profile: At only 13 inches high (tank body), it fits under many bed covers and doesn't block your rear view.
- Superior Baffling: Drastically reduces fuel surge and protects the integrity of the welds.
- Dual Bungs: Allows you to set up the pump on the driver or passenger side depending on your preference.
Cons
- Price Point: It’s an investment. You’re paying for the DOT certification and the USA-made quality.
- Pump Not Included: You’ll need to budget an extra $300-$600 for a quality 12V pump and hose kit.
- Bed Space: At 21 inches wide, you’re giving up a good chunk of your bed length.
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The Verdict
If you're just a weekend warrior hauling a little extra diesel for a boat, the ATI might be more than you need. But if you're a professional who needs to stay mobile, stay legal, and stay fueled, this is the best rectangle tank on the market. The ability to carry gasoline legally in an aluminum tank is the 'killer feature' that puts ATI ahead of the pack.
One thing to watch for: Ensure your 12V pump is properly grounded. Aluminum tanks are great, but they can build up static charge during fuel transfer if your pump isn't grounded to the truck frame. Do it right, and you'll have a portable gas station that works as hard as you do. For more options on organizing your rig, check out our full range of truck tool boxes.
