—A base for the gate and the bed floor

A magnet has nothing to grab back there.

Name: The Truck Bed Cup Holder
Brand: Steadi Labs

The 2015-and-newer F-150 converted nearly all of its body panels from steel to aluminum, cargo box included, and the firewall is about the only sheet metal left in steel. Sierra 1500s have been sold with a bed built from carbon fiber. Every 2005–2015 Tacoma got a composite inner bed.

Then paint, then a liner. So stop trying to get a grip on the truck. This holds the cup instead — and the bottom inch of your cup is the same in every pickup ever built.

4.9 average · 120 reviews

See the packs

from $14.95 · free shipping on every order

Ships from Orange, California. 90 days to change your mind, used is fine.

A white Steadi holding a can of beer, standing on the ribbed black bed rail of a pickup with the tailgate down behind it. — Primer, on the ribbed rail. Twelve colours in all.

—Read this before anything else

The magnet was never the problem. It was the bed.

Magnets grab iron, cobalt, nickel and most of their alloys, plus certain rare-earth metals. For everyday purposes that is the whole list. Aluminum is not on it. Neither is polyethylene, fiberglass composite, carbon fiber, or the plastic cap over your rail. Trucks have been quietly walking off that list for a decade, and nobody sent a memo.

F-150, 2015 and newer

Aluminum

body panels, cargo box included

The thirteenth generation converted nearly all body panels from steel to aluminum and took roughly 750 lb out of the curb weight. The frame stayed steel. The only significant sheet-metal component left in steel was the firewall.

GMC Sierra 1500

Carbon fiber

on the beds that have it

The fifth-generation Sierra 1500 has been sold with a pickup bed constructed from carbon fiber — a carbon-fiber-reinforced composite offered as an option on the AT4 and Denali. Check your own order sheet. A magnet reads that bed as furniture.

Tacoma, 2005–2015

Composite

every one of them

Every second-generation Tacoma was manufactured with a composite inner bed, including a deck rail system with four tie-down cleats. That is a decade of trucks. Honda’s composite in-bed trunk on the Ridgeline goes back to a plastics-engineering award in 2006.

Or work the other side

$14.95

nothing ferrous required

A 5.2″ moulded TPU base, about 3.6 ounces, that the drink stands in. It is not a magnet and it never needs bare steel. It does not care what your bed is made of, because it is not holding your bed.

Sources, quoted as published: en.wikipedia.org — Ferromagnetism, Ford F-Series (thirteenth generation), GMC Sierra, Toyota Tacoma, Honda Ridgeline · guideautoweb.com (The Car Guide, 2015 F-150 aluminum structure) · newatlas.com (GMC carbon-fiber bed). All fetched 2 September 2026.

—The one picture we cannot take for you

Walk your own bed with a fridge magnet. Thirty seconds.

Take a flat magnet off the fridge, or a rare-earth disc out of the junk drawer if you have one, and walk the truck touching it to each of these. Sort what you find into three piles: hard grab, weak grab, nothing.

The nine places to touch it
The inner face of the dropped tailgate, where a plate of food goes. The tailgate cap or trim panel. The bed floor, mid-bed. The side wall at rail height. The bulkhead behind the cab. The rail cap. The crown of the wheel well. The rear bumper. A frame rail, reaching underneath.
The tell that separates aluminum from plastic
If a spot gives you nothing, slide a strong magnet across it fast. On aluminum you feel a faint drag — sticky in motion, dead when still. That is eddy currents, the same effect that makes a magnet fall slowly down a copper tube and the same one an eddy-current separator uses to push aluminum cans out of a scrap stream. On plastic or composite you feel absolutely nothing.
Then look at what is left on the hard-grab list
For most people it is frame rails, hinges, latch hardware, fasteners and maybe the bumper. Every item on it is vertical, underneath the truck, or greasy. The magnet-friendly parts of a pickup are the parts you cannot set a drink on.
And even on a steel bed, three things eat it
Factory paint is around 100 microns all in. A spray-in liner is polyurethane sprayed anywhere from 1/16 to 1/4 inch, with one applicator setting the optimum at 1/4 inch on the bed and wheel wells. A drop-in liner is a rigid polyethylene composite tub — a whole separate plastic floor between the magnet and the steel.

en.wikipedia.org — Eddy current, Automotive paint, Bedliner · kjmagnetics.com FAQ, which names uneven contact, non-perpendicular pull, thin metal and surface coatings as what changes real-world pull force from the lab figure on the box. Fetched 2 September 2026.

Close-up of a white Steadi base sitting across the ribs of a textured black truck bed rail. — Point three on the walk. Stamped ribs and channels — a flat magnet laid across them touches on a couple of high spots instead of its full face, which is first on the magnet maker’s own list of what kills real holding force.

—How it holds

Base of support. That is the whole trick.

A can is 2.6 inches at its widest, and narrower where it touches down

Tilt it and its centre of mass has only a short way to travel before it clears that little footprint. After that it is going over, and no amount of steel underneath changes the arithmetic.

The base is 5.2 inches across, and fixed

It does not expand, contract or deform. It moves the edge the drink would have to lean past much further out, so it takes a far larger tilt to put the drink over. That is the entire mechanism and there is nothing else in it.

Six fins hold the bottom inch

Cans and bottles slide on over the top. Glasses and tumblers drop in through the fins. Either way the drink and the base then move as one piece instead of two.

On a ribbed gate it spans several ribs

A narrow container base gets a thin bridge across two of them. A 5.2-inch foot spans several and gets a genuinely wide footprint. On the slick polyethylene of a drop-in liner, the natural tack of the TPU is what resists sliding.

Macro photograph of the flared foot of a copper Steadi, showing the moulded STEADI mark and the texture of the TPU. — The flare, close. That width is the mechanism.

Can dimension: en.wikipedia.org — Drink can. The United States standard drink can is 2.6 inches in diameter at the widest point of the body. Fetched 2 September 2026.

See the packs — from $14.95

—What seats and what does not

Measure the bottom of your tumbler, not the lid.

A standard 12 oz can is 2.6 inches across. The Stanley Quencher H2.0 40 oz is about 3.1 inches at the base and seats snug — it goes in with a push. The Yeti Rambler depends on which one you own: the 20 and 30 oz tumblers are 2.75 inches and settle straight in, while the Rambler bottles run 3.0 to 3.4 inches and the 26 oz is too wide. A mug with a handle does not seat at all — the handle lands exactly where the fins grip, and that is a straight no. So is a stemmed glass.

Search by container

Every width below comes from a published specification, not from us. Where a spec is uncertain, the answer says so.

Container

Or the width across the bottom

Width in inches

A width across the bottom of the cup, in inches.

Six Copper Steadi bases holding cans of different sizes, lined up on a kitchen counter. — Settle it on the counter before it ever goes out to the truck.

Without a tape measure

A standard sticky note is three inches square. Stand your tumbler on one. If the base lands inside the paper, it seats.

Anything that overhangs, or anything borderline — hello@steadilabs.com reaches a person, and the answer will be honest either way, including a no.

—Where they end up

Gate down, engine off.

Three hours before kickoff with the gate down and a spread on it. Lunch on the job site with the bed as the table. Load-out at the ramp at dusk. Camp, once the truck has stopped and the fire is going. The drive-in with the gate down and a blanket. Those are the moments this is for, and every one of them is a truck sitting still.

The best surfaces are the dropped tailgate and the bed floor — flat, and the place a 5.2-inch foot does real work against ribs. The rail cap and a hard cooler lid work the same way.

Twelve colours, and on a crew the fastest use of that is one colour per person. It is the end of the argument about whose drink is whose, which on a job site is worth more than it sounds.

Four Steadi bases together in copper, ranger green, blacktop and primer. — Copper, Ranger Green, Blacktop, Primer. Four of the twelve.

—What each answer wants from you

Every other answer back there is trying to hold the truck.

And the truck is the variable. Different alloy, different liner, different cap, different bed length, different year. Read the middle column as a list of things that have to be true about your truck before the thing works at all.

The answer	What it needs from the truck	Where that lands
Magnetic puck holder	Bare, flat, ferrous steel at the exact spot the drink goes	The 2015-and-newer F-150 went aluminum through the body panels, cargo box included. Sierra 1500s have been sold with a carbon fiber bed. Every 2005–2015 Tacoma got a composite inner bed. Paint adds about 100 microns; a spray-in liner adds 1/16 to 1/4 inch; a drop-in liner is an entire polyethylene tub.
Clamp-on rail holder	A rail its jaw can close over, plus whatever cap or liner lip is riding on that rail	Fitment turns fussy the moment the thickness changes, which is why owners end up shimming. Then it lives out there permanently, snags cargo and argues with a tonneau.
Stake-pocket mount	Stake pockets, and that you want the drink up on the rail	The one genuine mounting convention in the bed — and it puts your cup above where anyone is sitting. It is a per-truck part you leave behind when the truck goes.
Suction cup	Smooth, non-porous and clean	A spray-in liner is textured on purpose, a stamped floor is ribbed and a dusty gate is neither smooth nor clean. Bathroom-tile technology in a job-site environment.
Adhesive pad or VHB tape	A patch of your bed you are willing to give up permanently	It holds right up until you want the bed back, and it does not bond reliably to the textured spray-in liner most people would want to stick it to.
Tailgate bar or folding table	To be carried out, set up and stowed again	Good gear, and it levels the bar top — not each person’s drink. The cup is back on ribbed steel or a wheel hump the moment it leaves the station.
The Truck Bed Cup Holder	Nothing. A flat spot is enough — gate, bed floor, rail cap, cooler lid	$14.95 · two for $24.95 · four for $39.95, $9.99 each. Free shipping on all of them. It lifts off when the bed has to haul something.

Every row above ours has a middle column. Ours does not. That is the argument, and it is the only one being made here. We are not claiming to be the best-made thing on that list. We are not claiming to be the cheapest. Only that ours is the row whose middle column is empty, because it never touches the truck.

If your bed is bare steel, unpainted and unlined, and you want the drink fixed in one spot forever, a stake-pocket mount is a genuinely good product and this is not it. That is a real fit, and it is worth saying out loud.

Truck and material figures quoted as published: en.wikipedia.org — Ford F-Series (thirteenth generation), GMC Sierra, Toyota Tacoma, Bedliner, Automotive paint · kjmagnetics.com FAQ · guideautoweb.com · newatlas.com. All fetched 2 September 2026 and current as of that date. Our own prices are our own.

—From people who bought one

None of these came from a truck bed.

Verbatim, unedited, not filtered by rating — and worth saying plainly before you read them: these are reviews of the Steadi, written by people using it on couches, boats and patio tables. Not one review in the corpus was written from a tailgate. They are here as evidence that the object holds a drink on an awkward surface, which is all they can honestly be evidence of.