I Googled this also, and did find a retailer had something posted about the 12 volt
system in RVs not being GFI equipped. I agree, there is a safety issue, however, as with anything, it must be used according to the guidelines of common sense. I cretainly wouldn't install this on the side of your trailer where water could flow into it, nor would I spray water into it!
I have nover seen one with a light, AS in more modern years uses a separate light fixture (I have converted mine to LED).
Again, if you have concerns I would give AS and Ventline a ring about this matter,
Again, I see nothing published by the actual mfgr stating not to install in the bathroom/ shower, and since AS uses these as standard equipment in their products, I think it is safe to say, they work safely in this application.