Full disclosure, I am not considering doing this, as our fridge is working
pretty well.

But I saw that the busdepot is selling a brand new Dometic fridge,
apparently to install as replacements in Westy's.  Here:
http://www.busdepot.com/j11895

Now, they don't provide installation instructions on the website, or even a
photo of the back of the fridge.  Has anyone ever seen one of these
installed?

This is a 3-way fridge.  The A/C power is 240v, but it wouldn't be too much
trouble to install a step-up converter in the van just for the A/C power.