No power after the truck was parked in extremely cold temperatures?

Yep, so what happens is the battery went bad and then trying to start it with a bad battery adds strain on the SJB (smart junction box) which is under the dash on the passenger's side. But to be sure let's check the main power fuses under the dash.

here is a guide to help:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

There are two fusible links that could have blown as well use a test light to check them here is a wiring diagrams so you can check it out. I also have included how to replace the SJB in case you need it. Check out the images (below). Please let us know what you find. We are interested to see what it is.