How to Transport a King Size Mattress | Move It Without Damage

Transport a king mattress by sliding it into a mattress bag, carrying it on its side, and hauling it in a 15-foot moving truck or larger.

For the full breakdown, see our best Bag for a King-Size Mattress guide.

A king size mattress measures 76 inches wide by 80 inches long, and that bulk makes moving it a two-person job with real risk of tears, stains, and bent frames. Before you rope it to the roof of an SUV, know this: U-Haul’s moving guidance says a 15-foot truck or larger is the right vehicle for a king mattress. Smaller cargo vans and sedans simply don’t have the floor space.

Here’s the sequence that works, based on U-Haul’s own moving guides.

What Size Truck Do You Need for a King Mattress?

A king mattress laid flat needs roughly 80 inches of uninterrupted length plus room for the rest of your load, and most smaller vehicles can’t provide that without bending the mattress.

That size guideline assumes you’re using a proper moving vehicle. U-Haul notes its advice applies to moving trucks, cargo vans, and trailers, not to sedans or compact vans. If you’re tempted to wedge a king mattress into a standard SUV with the tailgate half-closed, measure first — both the mattress and the doorway it has to clear.

How Do You Protect a King Mattress During Transport?

Before anything touches the truck bed, the mattress goes into a bag. U-Haul recommends a mattress bag as the first line of defense against dirt, moisture, and snags, and it’s a cheap insurance policy against a $200+ replacement cost.

For spring and coil mattresses, U-Haul says to move them lengthwise on their side. That orientation keeps the coils from shifting and makes the mattress far easier to carry through doorways and up stairs. Foam mattresses are the exception: U-Haul advises moving those flat with nothing stacked on top, since folding or standing a foam mattress can permanently crease the layers.

If you’re shopping for the right cover, our tested roundup of the best protective bags can save you from buying a flimsy plastic sheet that tears on the first corner.

How Do You Load a King Mattress Into the Truck?

Once the mattress is bagged and oriented correctly, loading follows a clear order. U-Haul’s guidance covers three points that matter:

• Load the mattress early, before heavy boxes and furniture go in, so it doesn’t end up buried or crushed.
• Stand it against a side wall or between larger items so it cannot slide during turns and stops.
• Secure it with side rails and nylon rope or ratchet straps, not bungee cords that stretch and release.

Box springs follow slightly different rules. U-Haul says these can travel on their side or flat, whichever fits your load better, and they should also be secured so they don’t shift.

The lifting itself matters too. U-Haul reminds movers to lift with the legs, not the back, and to use stair rails for support when carrying a mattress up or down steps. A king mattress is awkward and heavy; one bad lift can send you to urgent care and the mattress to the ground.

Is a 15-Foot Truck Really Necessary, or Can You Make Do With Less?

The catch is that you lose almost the entire floor to that one mattress, leaving no room for the rest of your belongings.

If you’re moving only the mattress and nothing else, a smaller truck might physically carry it. But the moment you add furniture or boxes, you’ll be stacking on top of the mattress or standing it on its side, which U-Haul says risks coil damage for spring mattresses. The 15-foot recommendation exists because it lets you lay the mattress flat AND load everything else around it.