ER is now showing their older model, the XV-LT, in three different cabin sizes spread across reg., extended, and crew cab F-550s, with a total of seven configurations. These look like photoshop creations, however, and are likely what you could order; I don't think they've actually built most of these variations yet. I also don't think any of these is the new 3/4 ton pickup base that Bill Swails has referred to on ExPo. To see them, scroll to the bottom of this page:
Their site also now states that the monster XV-HD can be ordered in two more configurations, each of which is even BIGGER than the behemoth in the photo. One is that same vehicle with same cabin, frame extended even longer, and a semi truck type fifth wheel attachment point for towing (horse trailer, cargo trailer, yacht?). They are calling it a toterhome. The other new configuration puts a toy hauler bay on the doubly extended frame.
Talk about an obsession with size! Wow! This is like an overland capable naval fleet.