I had AC issues on my coach and wrongly assumed it was a Freightliner Issue. I found out Freightliner supplies the compressor on the engine only and the rest of the system is installed by the coach manufacturer. My port is under the front hatch, but you may have better luck determining the exact location by posting in your Coach Forum.
David, Linda and the kids - Pebbles & Yogi
2011 Winnebago Journey 34Y, 2015 Ford Explorer