A small percentage of the sound proofing and insulation will be transferable but a large portion is permanently affixed.
...as for 4x4...
There is a conversion kit a 3rd party makes for $20,000.
That said it is made by the same company that made my seat swivels.. .and we know how big of a fan I am of their engineering department
If I go 4x4 it'll be factory when they finally land on our shores.
Time will tell.