Agree on the compressor operated vs vacuum pump. Aside from differnet belt and another component that can fail and leave you on the side of the road, the belt routing is horrendous on these trucks already, no need to complicate it further.
Air is handy too. It's not as good as a viair compressor, but I've used it for airbags (nice when you unload the camper somewhere and can air down the airbags and re fill), balls, bike tires, inner tubes, and in a pinch you could air up a tire if necessary. (Not reccomended, they're lighter duty cycle)
