[Kevin 1G Drummer]

Putting the battery down on the K member is super easy. I just used self tapping screws to hold the tray down, then used the stock tie down and bolted it to an existing hole in the lower frame rail. I had to pull some of the wires down a little farther to get them to the battery posts, but that just cleaned up the firewall a little more.

Another benefit to keeping it in the engine bay besides the cut out switch, is you don't need to rewire anything, and you keep 100% of your trunk space.