We had one on our last
boat. For a boat with an
outboard engine, it made sense. As she was a
catamaran, no gimbals were required to keep the unit reasonably level. I've read of them being gimbaled on
keel boats, but can't quite picture that.
So for that specific application, a
propane frig worked very well. At least after I modified the
installation by following the manufacturer's directions. (why can't boat builders read
installation manuals?) Good air flow is needed, and a small blower helps.
However, these are really rv units, not made for the
marine environment, so don't know how long they will last. I had to clean and
paint some rust, but it still was working when we
sold the boat at 10 years.