An Operator Presence System, which halts walking and lifting functions when the driver leaves the seat accidentally, prevents potential safety hazards due to misoperation. The parking brake disables truck travel to enhance driving safety. Start protection, fingertip operation system, and anti-restart protection from non-neutral gears ensure operational safety. A large capacity air filter with a safety element and pressure alarm. Power suspension design increases impact resistance to protect the power assembly from accidental impacts. Safety warnings include a reverse imaging system and warning lights.