Probably too early for any exact data, but I'd be interested to see how long it takes/how many gallons are burned in order to fully charge when not moving.
I'm curious as to whether the range extender will be able to function as a generator, and/or run while the vehicle is parked to charge the battery. Back-country camping for extended periods is a big part of what I plan on using my Terra for.
Probably similar to the way they fit in a Ford Maverick's bed. (The sheet sits on the wheel humps, and the tailgate drops to the correct height to align and support.)