I am not familiar with the newer Rangers, but most pickup trucks (and cars) have plastic covers over the floor area transition where it covers the door threshold. These can be easily snapped out. There will be room under that to run your power wire and coax, if needed. I have installed over 100 radios in vehicles over the years and have never run a power wire external to the interior of the vehicle, that is just not a good idea. The only problem you may have is getting through the firewall, which can be tough on newer vehicles. You may need to consult a stereo shop, or your local radio installer. What type of radio are you installing?