Jerry Can Compatibility: Will A Universal Jerry Can Fit My Truck Bed Or Roof Rack?

By Mike

Certified Professional Automotive Mechanic – Owner and Editor of VehicleRuns

Last Updated: June 24, 2026

A universal jerry can is designed to work with a wide range of vehicles, but that does not automatically mean it will fit every truck bed, bed rack, roof basket, or crossbar setup. Real-world fitment depends on the can’s dimensions, the type of carrier or mount you use, how much clearance you have, and whether your vehicle can safely support the load.

For DIY truck owners, the best approach is to treat jerry can fitment like any other accessory install: measure first, check weight limits, and confirm how the can will be secured during driving. A can that physically fits in the space may still be a bad choice if it shifts, interferes with tailgate operation, blocks cargo access, or overloads a roof rack.

What “Universal” Really Means for Jerry Can Fitment

In accessory terms, universal usually means the product is not vehicle-specific. It does not mean guaranteed bolt-on compatibility with every truck or SUV. A universal jerry can is typically shaped to work with common holders, flat cargo areas, and standard strap or clamp systems, but you still need to verify it against your exact truck bed dimensions or roof rack layout.

• The outside dimensions of the can
• Whether you are mounting it inside the bed, on a bed rack, or on a roof rack
• The holder or bracket style being used
• The filled weight of the can plus mount
• Clearance around the cab, tonneau cover, crossbars, and tailgate

If you skip those checks, a universal can may end up rattling in place, contacting painted surfaces, or sitting in a location that is inconvenient or unsafe.

How to Tell if a Jerry Can Will Fit Your Truck Bed

Start with Basic Bed Measurements

Measure the available length, width, and height where you want the jerry can to sit. Do this with any bed mat, toolbox, bed divider, tonneau hardware, or wheel-well intrusion in place. If you plan to mount the can near the bed wall, measure both the floor area and the upper clearance because beds often taper inward.

Check Fitment with Your Normal Cargo Setup

A jerry can might fit an empty bed but become a problem once you load recovery gear, coolers, a spare tire, camping bins, or a sliding drawer system. Think about how the can affects cargo access, tie-down points, and your ability to close the tailgate or cover.

• Make sure the can does not block factory tie-down loops
• Leave room for strap routing or bracket hardware
• Confirm the can will not hit a tonneau cover rail or hinge
• Check tailgate clearance if the can sits near the rear of the bed
• Allow enough space to remove the cap and pour safely when needed

For many truck owners, the easiest and safest truck-bed option is keeping the jerry can low and secured against a bed wall or inside a purpose-built holder attached to a bed rack or bed mounting panel.

How to Tell if a Jerry Can Will Fit Your Roof Rack

Roof rack fitment is more sensitive than truck-bed fitment because you must consider rack platform width, crossbar spacing, side rail clearance, and the vehicle’s dynamic roof load rating. Even a small can can create problems if the mount doesn’t sit flat or if the loaded height causes wind noise, garage clearance issues, or contact with rooftop accessories.

Measure the Rack, Not Just the Roof

If you are mounting on a basket, tray, or platform, measure the usable flat area between rails and note any raised edges or slats that may interfere with a holder. If you are mounting directly to crossbars, verify that the bracket is designed for your bar shape and spacing.

• Crossbar or platform usable width and length
• Distance between bars or slats
• Clearance to sunroof, shark-fin antenna, light bar, or rooftop tent
• Total loaded height after adding the can and mount
• The rack’s dynamic and static load ratings

A roof-mounted can should sit as low and as securely as possible. If the can is too tall, loosely mounted, or placed too far to one side, it can negatively affect handling and increase the chance of noise or bracket fatigue.

Common Jerry Can Dimensions and Why They Matter

Not all jerry cans share the same footprint. Traditional military-style cans, modern aftermarket cans, and compact utility cans can vary enough in width, thickness, and handle design to affect fitment. A few inches of difference can determine whether the can fits between bed accessories or inside a roof basket.

The most important dimensions to compare are overall height, overall width, and depth including cap and handle area. Do not rely only on capacity, because two cans with the same gallon rating may have very different shapes.

• A taller can may interfere with a tonneau cover or low rack basket
• A wider can may not fit a pre-made jerry can holder
• A thicker can may contact the cab, bed wall, or adjacent cargo
• A cap or spout assembly can add extra depth beyond the body of the can

Mounting Options That Affect Compatibility

The jerry can itself is only half of the fitment equation. The mount or retention method often decides whether the setup is truly compatible. A can that fits on the floor of the bed may not fit once you add a lockable holder, anti-rattle bracket, or metal tray.

Typical Mounting Methods

• Strap-mounted in the truck bed: simple and flexible, but only safe if the can cannot slide or tip
• Bolt-on holder in the bed: more secure, but requires flat mounting space and hardware clearance
• Bed rack side mount: good for keeping the bed floor open, but watch for width and tailgate/cab clearance
• Roof basket or platform mount: useful for overland setups, but only when rack load ratings and bracket fitment are confirmed
• Locking jerry can carrier: adds theft protection and stability, but increases bulk and required mounting space

If you plan to use a holder, measure the outside dimensions of the holder, not just the jerry can. Also check whether the holder is designed for metal cans, plastic cans, or a specific profile.

Weight, Load Limits, and Safety Considerations

A jerry can may physically fit your truck bed or roof rack and still be a poor choice if the weight is not properly supported. Fuel is heavy, and the mount hardware adds even more weight. That matters most on roof racks, but it also matters in truck beds if the can is mounted to a light-duty accessory panel or thin rack tubing.

Why Roof Mounting Needs Extra Caution

Roof loads raise your vehicle’s center of gravity. A full can mounted high up affects handling more than the same can mounted low in the bed. You must also account for rack dynamic load rating while driving, not just the static rating shown in some accessory listings.

• Check the vehicle roof rating and the rack manufacturer’s rating
• Include the weight of the can, contents, mount, and hardware
• Distribute weight evenly across the rack when possible
• Retorque mounting hardware after the first few trips
• Inspect for metal fatigue, loosening, or strap wear regularly

For everyday use, truck-bed mounting is usually simpler, safer, and easier to access than roof mounting. Roof storage is better treated as a carefully planned solution for specific travel or off-road needs.

Material and Use-case Compatibility

Fitment is not just physical size. You should also confirm that the jerry can material matches your intended use and the mounting environment. Metal cans and plastic cans behave differently in terms of expansion, abrasion resistance, and how they fit various carriers.

• Metal cans often work well in traditional steel holders but may need paint protection where vibration can rub surfaces
• Plastic cans can be lighter, but some holders clamp metal-can profiles more securely than plastic shapes
• A can used off-road should have a retention method that controls bounce and vibration
• If the can will sit exposed on a roof rack, think about UV exposure, temperature swings, and weather sealing

Also verify local and state rules for carrying fuel externally, especially on public roads, and always use containers intended for the specific liquid being carried.

Quick Fitment Checklist Before You Buy

Use this checklist to decide whether a universal jerry can will work on your truck without guesswork.

1. Measure the exact mounting area in the truck bed or on the roof rack.
2. Compare those measurements with the jerry can’s full external dimensions.
3. Add the size of any holder, bracket, locking cage, or strap hardware.
4. Check for clearance to the tailgate, cab, tonneau cover, crossbars, basket rails, and other gear.
5. Confirm the filled weight is within the bed rack or roof rack load limit.
6. Verify the mounting point is strong enough for road vibration and off-road movement.
7. Make sure you can still access the can, remove it, and use it safely.
8. Inspect whether the can’s shape matches the mount style you plan to use.

Best Practices for a Secure and Practical Install

If the jerry can passes your fitment checks, the final step is installing it in a way that stays secure over time. A good install keeps the can from sliding, tipping, vibrating, or rubbing against painted or powder-coated surfaces.

• Use a purpose-built holder or high-quality retention straps instead of loose cargo tie-downs alone
• Keep the can upright unless the manufacturer states otherwise
• Add protective padding where metal hardware could contact finished surfaces
• Recheck straps, bolts, and clamps after your first highway trip or trail run
• Avoid placing the can where it blocks emergency gear or spare tire access
• Store the can in the lowest practical location when possible to improve stability

In most cases, a universal jerry can will fit a truck bed more easily than a roof rack. Roof mounting can work, but only when size, mount compatibility, and load ratings are all clearly within spec.

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FAQ

Will a Universal Jerry Can Fit Any Truck Bed?

No. Universal means broadly compatible, not guaranteed fitment. You still need to compare the can’s dimensions and mounting method to your available bed space, bed accessories, and tie-down layout.

Can I Mount a Jerry Can Directly to Roof Crossbars?

Only if the bracket is designed for your specific crossbar size and shape, and the total loaded weight stays within the rack and vehicle roof limits. A flat platform or basket is usually easier to work with than bare crossbars.

Is It Better to Carry a Jerry Can in the Truck Bed or on the Roof?

For most owners, the truck bed is the better option because it keeps weight lower, improves access, and places less stress on the vehicle. Roof mounting is usually a secondary option for space-constrained or overland builds.

Do I Need a Special Holder for a Jerry Can?

A dedicated holder is strongly recommended, especially for roof racks or off-road use. It provides better retention, reduces movement, and makes fitment more predictable than relying on generic straps alone.

How Much Clearance Should I Leave Around a Jerry Can?

Leave enough room for the holder, strap movement, cap access, and vibration under driving conditions. As a practical rule, avoid tight contact with nearby panels, rails, or cargo so the can does not rub or bind.

Will a Jerry Can Fit Under a Tonneau Cover?

Sometimes, but only if the can height plus any mount hardware stays below the cover’s available clearance. Measure from the bed floor to the lowest part of the closed cover, not just the side rail height.

Can I Use the Same Jerry Can Mount in the Bed and on the Roof Rack?

Not always. Some holders are flexible, but many are designed for flat-surface mounting only or for specific rack systems. Check the bracket’s mounting hole pattern, hardware requirements, and load suitability before moving it between locations.