To make life easier go to here first -
https://www.thormotorcoach.com/owner-resource/ and create an account. Once setup download the documentation package for your coach. Included should be an A/V Distribution diagram which will give you an idea of what you're working with.
The one requirement to make this work is the coax between the sat receiver and the park cable input feed
can not have any splitters, combiners, electronic switches, DC power injectioners and sometime no A/B type switches. Cable splices are OK as long as you use connectors. No MacGyver twisting wire and black vinyl tape splices.
The image is an example of what you might see with regards to an A/V diagram. The device where the roof antenna and park cable come together will be a problem and the next item where the signal is then split for the three TVs is also going to be a problem.
I did it on my 2006 Hurricane. Even added a waterproof 12VDC power outlet near the park cable jack to power the antenna. The coach was built in the days when we had a bomb (box or many buttons) for selecting what coax based signal was going to which TV. Made it easy to just disconnect the park cable coax from the bomb and plug it into the sat receiver. I also have a roll of 100' of coax and 18/2 power wire which made it easier to find a clear line of sight to the satellites.
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