Caterpillar Building Construction Products makes backhoe loaders, wheel loaders, telehandlers, and mini excavators. Excavators are usually employed together with loaders and bulldozers. Grousers are commonly used on construction vehicles such as bulldozers, loaders, and excavators. Backhoes are usually employed together with loaders and bulldozers. Lift-equipped trucks are referred to as automated side loaders (ASLs). This includes massive bucket wheel loaders and miles of conveyor belts. Caterpillar is the world's largest manufacturer of wheel loaders. The Challenger turret had been so large to allow space for two loaders. Some operating systems vendors may have their own boot loaders. The introduction of rifled muzzle loaders (also classed as RMLs) rendered smoothbore guns largely obsolete. GRUB 2 and elilo serve as conventional, full-fledged standalone UEFI boot loaders for Linux. This was also used for expansion or upgrades such as fast loaders. The following tables compare general and technical information for a number of available boot loaders. The M45 is operated by two loaders and one gunner. The five-man crew consisted of a driver, gunner, commander and two loaders.