w/ the exception of the GN trailer it sounds like you could make better use of a garage coach.
I don't think you'll find a CoE to be wider in the cab....in fact everyone I've ever been in was pretty crowded (w/ the dog box between the front seats)....and theyre noisy (think engine in the cab between you at your waste level).,...dont get me wrong theyre cool (again)....and if you have a LENGHT issue you could save a few feet w/out the engine out front.
do you actually NEED a pickup bed (enclosed sides & tailgate)? would a flat deck and drom box work?
BOB will be over here in a bit to direct you to another site for converting/singling tractors and registering them as motorhomes....until then have a look at what Greg at RV Haulers does to "retired" tractors -
https://www.youtube.com/user/greggeshields
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Don R.
'04 Haulmark (M42386) 42', 2 slide, 10kw -
Pictures
'04 F350 CrewCab Longbed 4x4, 50g aux tank & gear vendors dbl over