This was so much easier on my Excursion :P

My '13 Platinum has the regular sized mirrors. They are power folding, heated, etc.

I'd like to swap them out to towing mirrors but specifically the power telescoping kind. Is this plug and play? (is the wiring already there and I just plug the switch in?)

 

The wiring should be in the door and of course in the mirror. However, you'll need a second smaller switch to make them telescope.
Here's a link to another forum showing the switch:
power telescoping tow mirror - Ford F150 Forum - Community of Ford Truck Fans