I keep coming back to the smaller murphy bed setup... The Isata 5 doesn't really seem to have any usable ground clearance.. the 4x4 would basically be for wet grass, slight mud, snow.
The 24' platform (6 feet shorter) on a 4x4 5500 chassis would really be awesome.
Bigger super singles, lockers, emissions delete (sshhhh), "Xplorer package" and this would be a KILLER setup.