U-Haul publishes these cargo capacities: Pickup Truck, 76 cubic feet; Cargo Van, 246 cubic feet; 10' Truck, 402 cubic feet; 15' Truck, 764 cubic feet; 20' Truck, 1,016 cubic feet; 26' Truck, 1,682 cubic feet; 29' Truck, 2,057 cubic feet.

Source: U-Haul truck specs

Penske publishes these cargo capacities: Cargo Van (High-Roof), 404 cubic feet; 12' Truck, 450 cubic feet; 16' Truck, 800 cubic feet; 22' Truck, 1,200 cubic feet; 26' Truck, 1,700 cubic feet.

Source: Penske truck specs

Budget publishes these cargo capacities: 12' Truck, 380 cubic feet; 16' Truck, 658 cubic feet; 26' Truck, 1,698 cubic feet.

Source: Budget truck specs