RE: 12v Florescent Fixture
I have one of those, picked up a Lowes several years ago.  My original
intent, since it ran on 12v DC, was to mount it in the Westy and wire it
in.  But I never go around to doing that.  I put a couple of magnets on it
and have used it in the Westy with the batteries.  It is a battery hog and I
never felt it was giving me as much light as I wanted.  But it is an
economical answer and since it has a switch built in should be easy to wire
into the aux 12v system and mount permanently.