I've repurposed the CAT5 cable with the Blue Sky IPN Pro remote. The CAT5 cable includes 4 twisted pairs. I used one twisted pair for the shunt connection, and two of the twisted pairs to create a 4-pin RJ-11 connection for data. I left one of the pairs unused.
Yes, just pull the monitor and fish around with your hand.
I carefully cut a rectangle in the aluminum with a Dremel, I've read that other folks use a Multitool. That was my biggest fear in the entire installation!
2015 30' Classic, "Chez Nu"
2014 RAM 2500 w/Cummins Diesel
ProPride Hitch, 400 W Solar