9A. The crew installed the Plug-'N'-Play system on the chassis. This system offers a 12-volt DC compressor that will quickly fill a reserve air tank and electric solenoid valves to distribute the air to the 'bags lightning fast, all in one neat package. Note that since the box was mounted to the center of the crossmember, a substantial portion of the bed floor needed to be removed before it could be reinstalled. But, since this unit is so small, you could install it off to the side of the bed if space is a concern. Once the box was mounted, all that was needed to make it work were 12-volt positive and negative battery connections, four air lines running to the 'bags, and a switch box, which, of course, plugged right in.