Personal preferance!
It's a pain to take it out and set it up.
Mounting it and hard wiring is a great way to get it out of the way and, to use it all you need to do is pop the hood! you could use wiring quick disconnects but, it's really not needed. the compressor is mounted right next to the battery, just make sure you leave a little slack in the wiring. when you remove the compressor just set it off to the side in the engine compartment.
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