So I installed my EMS-HW30C, was not hard, took it slow to make sure I did it correctly. Took maybe an hour and a half. I tried to remember to take pictures as I went I forgot to take some as I went though. I will try to explain what I did.
1. So for my particular model the Power Panel was under the fridge. So after disconnecting the main power cable to the trailer, and disconnecting the batteries (Via battery disconnect switch up front), I opened the front panel that allows you to access the fuses in the power panel. I also flip all the breakers off on the panel just to be safe.
2. With the panel open and the fuses and breakers exposed, there are two screws at near the top that hold the main front panel to the power box. Once you remove those two screws, there are two plastic clip looking things hold the bottom of the panel. so swing it from the top towards you and the panel should come off. You should see this:
2. Remove the 4 screws from each of the corners that hold the box to the wall. Once you remove them, you can pull the box out and you will see all the wires attached to the backside.
3. The main power wire was the orange one plugged into the top left of the power panel. It is bundled with a bunch of other wires, zip tied to the other cables and screwed to the floor. I unscrewed the zip tie connection to give me more slack, but did not cut the zip tie. I then cut the orange cable and stripped the shielding back along with the cables. The kit comes with connectors for the ground wires on each side. You can use the clips or just bend the ground cables around the screws in the box.
4: Follow the instructions for the EMS-HW30C for routing the wires. It was pretty easy, basically the black and white cables on each side along with the ground cables. On the side going to the power panel, run the black cable through the ring sensor with the arrow on the sensor pointing up. That was not really explained well. Once you have it hooked up, there was not much room or excess cable to allow you to mount the box on the floor, so I put heavy duty velcro on the box and pushed it against the wall to the left of the panel. It was tight and I had to push the panel box in, and squeeze my hand in to push the panel against the wall to secure the velcro. Only time will tell if the velcro will hold. Also don't forget to install the data cable for the EMS display. I ran the display right outside the power panel and secured it to the right side. Everything worked as it should once I connected the trailer back to power and connected the batteries again.
Hope this helps someone, also I found a couple of youtube videos that where helpful too. So check there as well.