Well, I cheated, and just used T-taps for the power connectsions. The connection is inside the cab, and I don't like making things too permanent. However, I did have to solder on extensions for the power cable. What came with the camera wasn't even long enough to make it inside. My solder joint sits, about an inch outside the grommet.
Quick run down here. I took the tail light out. It's not necessary, but very easy, and makes the job easier.
Required:
1. Small fish tape
2. T20 Torx
3. 10mm socket
4. Electrical tape
5. WD40
6. Philips screwdriver
7. T-taps
8. Dielectric grease (for inside of all connections and tail light seal)
1. Remove the license plate and passenger side tail light access panel. Just kinda pull up/out on the bottom.
2. Remove tail light. Unplug the connector, and remove the 3 nuts. IIRC they are 10mm.
3. Pull the grommet for the passenger side marker light inside the cab. Then reach through the hole and push the marker light housing out of the fender. There is a spring clip towards the rear, and a tab/slot in the front. I didn't get a picture of the back of the housing, but I think there are some floating around here. Just remove the bulb socket, and set the lens aside. Removing the bulb will help prevent breaking/losing it.
4. Run the fish tape through the small hole behind the license plate over to the marker light hole. It will take a bit of finesse, but really not too bad. Tape your two wires to the fish tape, and pull them back through the license plate hole. If you've never used a fish tape, just tape the wires a few inches back from the connectors, so they pull backwards and don't get stuck inside. Take your time. You may need to gently pull back on the wire to keep from getting caught. Once through, tie the wires to the trunk latch. This will give you enough wire to work with later, and keep you from accidently pulingl them back through.
5. Pull your two wires through the marker light grommet. Make sure they're facing the right direction. I found pulling the grommet down close to the bulb (off the wrap) and spraying a little WD40 made it a snap. Now pull the wires to just a little snug, pop the grommet back in, replace the bulb/lens and snap the housing back in the fender.
6. Make your connections for the power. I made my connections on the tail light vs the harness. Tail lights can be replaced much easier if ever need be. Brown wire is hot, and I used the black wire leading directly back to the main harness. I used T-taps, because they're easily removed to remove the light and/or wiring. You will probably also need to make a connection for the head unit or screen's activation wire. I tapped the hot wire of the camera, right before the connection to the brake light.