Let me chime in a bit on the thought process, and some other details of the Overlander;
It primarily is a comfy lightweight base camp.
The real focus is on not overloading the truck that it is to be mounted on to. It is a full slide-in unit, 6.5' in length, with a 66" interior height (more on that later).
The Overlander unit will be fully outfitted by us at Wasatch Overland, that includes full insulation and a 'second' interior wall system, using water impervious materials that are also super light weight (almost half the weight of the wood equivalent).
There will be three variations of interior layout to choose from, all three with over 6' sleeping areas, even running widthways. 2 of the 3 layouts will include cabinets and substantial electrical systems.
All units will include solar, shore and dcdc charging, interior lights and a Maxxair 7500k fan. Options will include skylight, water and heat systems, ladders, rack etc.
The overcab section is designed for maximum storage, but also can be utilized for a secondary sleeping area with an approximate 22" max height, 73" width and 45" fore-aft dimension.
As for the height, this unit was strategically designed to have minimum wind resistance, whilst still allow for the user to sit up fully, and move around with ease inside, for putting on ski-pants etc, sitting up to cook is no problem with the interior designs. Tear drop trailers, Rtt's and many existing slide-ins and campers don't allow for standing up inside, the reason for overlanding is to be outdoors, with a comfy warm base to return to, and we think the Overlander will fill that niche.
It may not be for everyone, but a (proposed) sub-900lb fully built out camper, certainly has the attention of many people.
If you have any questions, feel free to ask, I'll answer what I can.