I use a Haloview in which the monitor straps to the rearview mirror of the truck. It is a natural place to look for what's behind me. I don't really need to see the front of the trailer all the time. The monitor has enough reflection when switched off that I can leave it mounted for the entire trip, even when unhitched.
I tried to tap into the powered mirror for the monitor's power but there wasn't enough juice there. I don't like any distractions in the cab (dangling wires). I ran the power cord above the headliner, behind the plastic cover on the passenger-side post, behind the AC vent, and into the passenger-side kick panel under the glove box. The F-250 has a fuse box there that you can piggyback an outlet. My F-250 has upfitter switches so I tapped into one of those at the same spot as mentioned above. I plugged the stock power cord into a 12V
outlet that I had wired to the upfitter pigtail that comes through the firewall and secured with a zip tie. Removing the plastic cover on the post was easy -- just be careful with the airbag and secure the wire to avoid the airbag. The wire is completing hidden.
I also bought some spare rubber straps for securing the monitor to the mirror. Those things look like they might be easy to lose.
Installation of the camera was simple using the existing wires. Seems that I used the original bracket but I can't be certain. It's been a day or three since I installed the camera. The camera is not wired to the monitor. There is a bit of lag but not enough to warrant installing the other antenna.