Here is a thread that may be more useful. I'm planning on ordering one as soon as my truck arrives.
Reverse beeping like a forklift
So we got the f150 last night and this morning at 4am when my wife heads to work (truck is her car) I could hear back up beeping through the walls of the house. Is it there a button to turn this off or reduce volume? Googling says probably not as its not unique to lightnings, the hybrid f150s...
www.lightningowners.com