Definite advantage to being able to reach all your engine compartment, and if you've got a tall truck, you might want to consider this, the Elevator

See where his feet are? That's step one, then look at his right hand, that's the lever It hooks in place, and you are then hovering over the engine bay, able to work without straining your knees backward, or your lower back I saw the demo guys in action, and sorry that the still photos don't really convey the ease of motion it takes to get comfortable horizontally in place over what would be