Among the most compact evaporators are the european OEM rear seat A/Cs mounted under the seat (pugeot) or in the console (VW Jetta early euro version) The Kysor heat/cool coil you refrerence is more than 5" (maybe 8" overall) and is probably less than 6000 BTU for sleeper cab An evaporator...

Testing 1-2-3
Lots of changes for Tim and his Band of Brothers
Hope we can recover the picture of the Duke with A/C gage manifold set.
Perhaps Tim will include Duke on the home page if we've lost picture/cartoon ID. I heard the Duke had a cattle ranch in Arizona
Hotrodac