Keep an eye on the forum. Sounds like this would have met your needs, but its sold. https://expeditionportal.com/forum/threads/1999-ford-f250-4x4-diesel-with-lance-camper.198629/
Sold now, I think
Appears to be no longer posted. But this Bucher is pretty cool. http://www.autoscout24.ch/de/d/bucher-wohnmobil-sonstige-1998-occasion?allmakes=1&drive=3598&fuel=3448&index=0&nav=8&page=1&sort=price_desc&vehid=1352232&vehtyp=70
Imagine this Fuso with an American Hero or similar TC.
http://www.800toolbox.com/flatbeds/Fuso-Flatbed-truck-1.jpg
http://northstarcampers.com/uploads/catalog/cbf48e91c9a464472fa0d7e3d9a121ee.jpg
In April the manufacturer rep at Sprinterfest East said a 4matic based system should be available in 18 months or so, which also coincides with the next gen 4 cylinder turbodiesel.