On my 2012 Knight 36PFT I installed my own satellite dish. Like you I was told that the wiring is pre-run to a location marked on the roof. After inspecting the TV receiver cabinet for wiring I found two coax wires tagged with the roof location but nothing for the control wires that all automated dishes need in addition to the coax wires. I called the Monaco tech line twice to ask how the control wires are handled. Both times I got the same answer that there was a conduit containing a chase cord to pull the control wire with. I cut the 2" hole in the roof where the label was, and found two coax cables but nothing else.
At that point I was faced with running the control wire across the roof and adding another hole or finding someway to snake the control cable inside the coach through the hole I just made. It took awhile but I was able to go from the hole in the center of the roof to the A/C duct on the right side of the coach (the same side as the TV receiver cabinet), ran the control cable inside the duct and then it was a simple task to get from the duct over to the cabinet inside the ceiling.
I have since informed Monaco of their incorrect answers but I doubt it did any good.
2012 Monaco Knight 36 PFT
2019 Jeep Grand Cherokee Overland
2005 Jeep Rubicon Unlimited on 2007 16' Car Hauler trailer.