Work truck gear, ranked for the people who load it every morning.
Protection
Tonneau cover with a tool box: what actually works together
A crossover box sits above the rails and a cover needs that space to close, so the stock answer is no. There are exactly two ways to get both, and each one is a different purchase.
Our top pick: the Extang Trifecta Toolbox 2.0 — F-150 6'7" (2021-2025).
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A standard tonneau cover will not close over a standard crossover tool box. The box's lid and ends sit at or above the bed rails, and that is exactly the space the cover's rails and panels need. Two combinations do work: a tool-box-edition cover, whose rails and panels are built short so they start behind the box, or a box built to sit under the cover line — either a low-profile crossover or a purpose-made under-tonneau box.
Which route is right depends on what you already own. If the box is in the bed and you like it, buy the cover around it. If the cover is on the truck and you want security, buy the box that fits under it. Buying both at once, the cover-edition route is usually cheaper and always simpler.
Tool-box-edition cover if the box stays. Low-profile or under-tonneau box if the cover stays. What does not work is a full-height crossover box and a standard cover, in either order, with any amount of adjustment.
Measure these three things first
Every failed version of this combination fails on a measurement someone assumed. There are three, and a tape measure settles all of them in five minutes.
Rail-top to box-lid height. Lay a straight edge across the bed rails and measure up to the highest point of the box lid, including the handle. If that number is greater than zero, a standard cover cannot close over it.
Box footprint along the rails. Measure front to back where the box feet sit on the rails. That is the bed length a tool-box-edition cover has to leave uncovered, and it has to match the cover's stated gap.
Clear bed length behind the box. Bulkhead to tailgate, minus the box footprint. On a 5'7" bed with a 20-inch box footprint there is not much left, which is why this combination makes far more sense on a 6'6" or 8 ft bed.
The picks, ranked
Two tool-box-edition covers and three boxes sized to live under one. Prices are live from the Amazon catalog; the button reads check price if a number is not available.
A soft folding cover built short on purpose: the rails and panels are sized to start behind a crossover tool box instead of fighting it. That is the whole point, and it is the cleanest answer to the box-and-cover problem because neither half has to be cut, notched or packed up on spacers.
Protection
9.3
Weather seal
9.2
Install
9.5
Durability
9.2
Value
9.5
Why we picked it
+Designed around a crossover box rather than in spite of one
+No cutting, no notching, no spacer kit
+Folds in sections for bed access
+Clamp-on install
Good to know. It only works if your box matches the opening the cover leaves. Measure the box's footprint along the rails before ordering, and accept that the covered bed length shrinks by whatever the box occupies.
A heavy-wall aluminum box built to the one dimension that matters here: it sits low enough and short enough to live under a standard tonneau cover rather than replacing it. Same RigidCore lid and Secure Lock hardware as the UWS crossover boxes, in a footprint that does not foul the cover rails.
Build
9.6
Weather seal
9.5
Security
9.5
Bed usability
9.4
Value
9.0
Why we picked it
+Purpose-built to clear a tonneau cover
+Heavy-wall aluminum, not a stamped shell
+Foam-cored lid resists the flex that breaks a seal
+Keeps the cover you already bought
Good to know. It is the expensive way to solve this problem. A 48-inch box also does not span the bed the way a crossover does, so long items go across it rather than inside, and the volume is well under a full-size crossover's.
JOBOX's Gear-Lock drives multiple lock points from one key turn, which is the single biggest difference between a box a thief opens with a screwdriver and one he walks away from. The rest of the box is honest fleet-grade aluminum.
Build
9.5
Weather seal
9.4
Security
9.7
Bed usability
9.2
Value
8.9
Why we picked it
+Multi-point locking is genuinely harder to defeat than a single center latch
+Fleet-grade build with parts availability years out
+Low profile preserves rear visibility
Good to know. It costs premium money and spends it on the latch rather than the lid. If your box lives behind a locked gate every night, you are paying for security you do not need.
The Super Duty part number of the same idea, and a long bed is where it makes the most sense: give the first stretch of bed to a box and what is left under the cover is still longer than a half-ton short bed in total.
Protection
9.3
Weather seal
9.2
Install
9.5
Durability
9.2
Value
9.5
Why we picked it
+Long bed keeps real covered length behind the box
+No modification to either the box or the cover
+Clamp-on install
Good to know. Same condition as the F-150 version — the box has to fit the gap the cover leaves. It is also a soft cover, so the panels take no weight and no snow load.
Published specifications
Fitment
Ford F-250 / F-350 Super Duty 2017-2026, 6'10" bed (81.9 in)
A low drawer unit designed to sit under a tonneau cover rather than fight it. If you have already committed to a cover and still want a drawer, this is the shape that works.
Build
9.2
Capacity
8.9
Install
9.0
Day-to-day access
9.5
Value
9.2
Why we picked it
+Designed from the outset to clear a cover
+Drawer access beats reaching into a well under a half-open cover
+Dee Zee hardware is widely stocked
Good to know. Without a cover it is an exposed drawer in an open bed, which is the worst of both worlds. Buy a box instead.
Makers including Extang and Access publish specific tool-box versions of their folding and roll-up covers. The rails are shortened and the panel count or roll length is reduced so the cover begins behind a crossover box at the bulkhead. Nothing is cut, nothing is packed up on spacers, and both products keep their warranties.
What you gain. A properly sealed cover, a locking box, and no modification to either.
What it costs. Covered bed length. The box's footprint stays uncovered, because the box is the cover for that section.
The condition. Your box has to match the gap the cover leaves. A 69-inch crossover with a wide footprint and a cover expecting a narrow box do not meet in the middle.
This route suits a truck with a long bed and a box already bolted in. On a short bed it can leave so little covered length that the cover stops being worth fitting — which is the point at which route two becomes the better answer.
Route two: a box that lives under the cover
The other direction is to keep a standard full-length cover and choose a box that fits beneath it. Three box formats do this, and they are genuinely different products rather than variations.
Low-profile crossover boxes
A low-profile crossover sits at or just below the rail line instead of proud of it. The lid clears the underside of a folding cover's panels by a small margin, and the margin is what you measure. The volume penalty is real and the makers are quiet about it — the full set is ranked on low-profile tool boxes.
Under-tonneau boxes
A purpose-built under-tonneau box, like the UWS Secure Lock on this page, is designed from the start to live beneath a cover: shorter, lower, and with the lid hardware kept inside the box's own footprint. It is the most expensive route and the one least likely to need a tape measure twice.
Under-cover drawers
A drawer that slides out from under the cover, rather than a box you open from above, removes the clearance problem entirely — you never need to lift a lid inside the covered space. It holds less and it costs more per cubic foot, and the format is covered on storage under a cover.
Four routes to the same outcome, compared on what each one costs you.
Tool-box-edition cover
Low-profile box
Under-tonneau box
Under-cover drawer
Keeps your existing box
Yes
No
No
No
Keeps your existing cover
No
Usually
Usually
Usually
Covered bed length lost
Box footprint
None
None
None
Volume
Full-size box
Reduced
Reduced
Lowest
Lid access under the cover
Not needed
Needs clearance
Needs clearance
Not needed
Relative cost
Lowest
Low
Highest
High
What this combination is really for
Security and weather are two different problems, and a cover solves only one of them. A latching cover keeps rain and casual eyes off the bed; it does not keep a pry bar out, which is the argument on are tonneau covers secure. A steel or heavy-wall aluminum box with a real lock is the security layer, and the cover over it is the weather layer. That is why the combination is worth the trouble on a truck that holds tools overnight — and why, on a truck that does not, picking one or the other is the cheaper call. Tool box or tonneau cover works that decision through.
Questions people actually ask
Can you have a tonneau cover with a tool box?
Yes, in two specific combinations. Either fit a tool-box-edition cover whose rails and panels are built short so the cover starts behind the box, or keep a standard cover and use a low-profile crossover, a purpose-made under-tonneau box or an under-cover drawer. A full-height crossover box and a standard cover will not work together.
How much clearance does a tool box need under a tonneau cover?
The box lid, including its handle, has to finish below the plane of the bed rails, because that plane is where the cover's rails and panels sit. Lay a straight edge across the rails and measure down to the lid: if the lid is proud of the rails by any amount, a standard cover cannot close. Makers publish box heights, but the handle is often the part that catches.
Is a tool-box-edition cover cheaper than buying a new box?
Usually, and it is also simpler, because the box you already trust stays in the truck. The trade is covered bed length — the box footprint stays uncovered. On a short bed that can leave too little covered length to be worth it, which is when a low-profile or under-tonneau box becomes the better buy.
Does a tool box under a cover still lock?
Yes, and that is the point of the combination: the box provides the lock and the cover provides the weather seal and the privacy. Treat the cover as a deterrent rather than security, and put anything you would hate to lose inside the box rather than loose in the covered bed.
Which bed length suits a box-and-cover setup?
A 6'6" or 8 ft bed. The box takes a fixed footprint along the rails regardless of bed length, so on a 5'7" bed there may be very little covered length left behind it. Measure bulkhead to tailgate, subtract the box footprint, and decide whether what remains is worth covering.
Last reviewed November 10, 2026. Think a figure here is wrong? Tell us at contact@toolboxandtruck.com and we will check it, fix it and date the correction — see our editorial policy.
