I'll have to get a moderator to add these to the original post, but here is some other options for our models.
Keep HU on until doors are opened.
Most generation 10 F150's don't have the option for the stereo to turn off once the door is open(and key is out). So to upgrade your wiring, and achieve this, do the following.
Other custom options:
If you are a DIY'er, custom boxes usually be a better fit and option for memebers who want a unique look/sound.
You can place your amp almost anywheres, just try to keep it away from peoples feet and in a cool dry place in your truck. With some custom work you, finding a place to put a set of amps shouldnt be to hard.
Behind the seat amp rack
The links below have great information on alternators, batteries, wiring, and system usage (watts/amps).
Finally, for those of you who want to make your audio/electrical system more efficient, I suggest doing the "BIG 3". This upgrade works great and is for anyone who wants a more efficient system.
Adding a battery: