I answered my own question: Yes, you do have to remove the exterior vent cover on the Washer Dryer. There is only just enough hose as would be expected. There was no hose clamp used so pulling the unit without removing the vent would not have hurt anything but it would be impossible to hook back up.
In other news... Holy COw does that thing weigh a lot! Also, there certainly is a plumbing vent valve back there as well as a large hole to the underbelly.
1998 bounder 36s V10 F53