"Jim," wrote in
:

I would think the engine/exhaust heat could be enough to drive the cycle
(at least while underway)


There are lots of uses for the heat if we'd put in dry stack exhausts.
There's plenty of heat for one of these fridges. The propane flame they
use is about the size of a propane torch, quite small indeed. ON DC power,
the big fridge/freezer in my motorhome drew about 6A at 12V.

--
Larry