Self-loading logging trucks include the 1995 Woodpecker model by Western Star and the 1977 self-loader truck by Kenworth. Eighteen-wheelers and semi-trucks with loading booms are included in the self-loading category. Trucks may be equipped with onboard electronic scales. The Western Star Model 4964F features a 435-horsepower Cummins N14 engine with engine brake and an Eaton Fuller 18-speed transmission and an Air Ride cab. The Kenworth features a 400-horsepower Cummins Big Cam 1 engine, Fuller transmission and 20,000-pound front axle weight.
The 1995 Woodpecker by Western Star has a 267-inch wheelbase, Hendrickson suspension, a front axle weight of 12,000 pounds and a model DS404 rear axle. The truck is equipped with a Ramey loader and 1/4-cord grapple, 102-inch log stakes, hydraulic outriggers and SI onboard scales.
Truck manufacturers mount a boom and grapple on the chassis of a logging truck, either at the end of the truck or just behind the cab, to make it self-loading. The truck’s driver uses the boom and grapple mounted at the truck's end to load a trailer. The truck driver operates the boom and grapple that loads logs 40 feet long, to move the timber from the forest to the manufacturing plant. Added weight of the logs on the truck reduces its payload capacity for logging operations.