U-Haul vs Penske vs Budget Truck Sizes: The Interior Dimensions That Actually Matter

Renting a moving truck sounds simple until you are standing in the lot looking at a row of box trucks, trying to remember whether a 16-footer swallows a full backline or leaves you making a second trip. U-Haul, Penske, and Budget all sell "sizes" by the foot, but the number on the side of the truck is the exterior length. What you actually load into is the cargo box, and those interior dimensions do not line up cleanly across brands. Here is the real breakdown, with the numbers that matter, plus how to tell which truck actually fits your load.

The interior is smaller than the name

A "26-foot truck" is not 26 feet of usable space. Some of that length is the cab, and the wheel wells eat into the floor width. The only honest way to compare is interior length by width by height and the resulting cubic feet.

U-Haul

U-Haul's published moving truck specs run:

• 10 foot: 9'11" x 6'4" x 6'2", about 402 cu ft
• 15 foot: 15' x 7'8" x 7'2", about 764 cu ft
• 20 foot: 19'6" x 7'8" x 7'2", about 1,016 cu ft
• 26 foot: 26'2" x 8'2" x 8'3", about 1,682 cu ft

Note the width jump: the 10-footer is only 6'4" wide, so two 30-inch road cases side by side already crowd it. The 15 and 20 both open up to 7'8".

Penske

Penske runs a slightly different fleet. Its 16-foot truck lists up to 16' long by 7'7" wide by 6'6" high for about 800 cu ft, and its 26-foot truck lists up to 25'11" long by 8'1" wide by 8'1" high, roughly 1,700 cu ft with a 10,000 lb load capacity. The catch is that Penske 16-foot height: at 6'6", it is nearly two feet shorter inside than U-Haul's 26-footer, so tall cases that stack fine elsewhere will not clear.

Budget

Budget's 26-foot box truck measures about 312" x 97" x 97" (roughly 1,698 cu ft), close to U-Haul's, while its 16-foot truck comes in narrower and lower at about 658 cu ft. Two trucks wearing the same "16 foot" badge can differ by well over 100 cubic feet of real space.

Cubic feet is the wrong number to trust

Rental sites lead with cubic feet because it makes the truck sound roomy. But you do not load loose volume, you load boxes and cases that do not compress. A 1,682 cu ft truck packed with rigid road cases realistically uses 60 to 75 percent of that number once you account for gaps, aisle access, and the fact that a 40-inch case cannot half-fill a 45-inch gap.

Two dimensions matter more than total volume:

• Interior height. A 6'6" Penske 16-footer and an 8'3" U-Haul 26-footer are different loading problems. If your tallest case is 78 inches, several "big" trucks are out before you start.
• Payload weight. Volume runs out slower than weight for dense gear. A 26-footer rated for 10,000 lb fills up on weight long before the box is visually full if you are moving amp racks, transformers, or tooling.

How to pick without guessing

The old method is to eyeball your pile and round up a size, which is how people end up with a half-empty 26-footer or a second trip they did not budget for. The better method is to measure your actual cases and plan the load before you reserve.

That is the whole reason we built the rental truck size library in Truck Packer: the real interior dimensions for Penske, U-Haul, and Budget are already in the app as presets. You drop in your cases, pick a truck, and see in 3D whether it fits, with room to spare or not at all, before you pay for the rental. If the 16-footer comes up short, you find out on screen instead of in the parking lot.

The takeaway

Ignore the number on the door. Compare interior length, width, and height, watch the payload rating, and remember that cubic feet is a marketing figure, not a packing plan. Measure your load, match it to real interior dimensions, and the "what size truck do I need" question answers itself.