MrWizard wrote:
this topic cam up "VERY" recently
IIRC the 12v fans have short blades and low profile
that member/poster is putting it their bedroom above the bed
what we need is a link to the fan and the specs
might be something like this made for RVs
http://www.amazon.com/Global-Electric-36-inch-Non-Brush-Reversible/dp/B00E58CRL8/ref=sr_1_3?ie=UTF8&qid=1416201341&sr=8-3&keywords=12v+ceiling+fan
That is exactly the fan I am getting.  I won't be removing the light, but connecting on to it's power wires and solidly mounting it right on a rafter, right where two sheets of paneling meet.  I also forgot to mention, I am a full time live in, and never plan to use my TT as a TT, It is my home.  
I would also like to mention, I definitely don't want to use anything that pulls in outside air, in Northeast Texas most of the time it's to hot and muggy for fans like those roof or vent mounted models.
But whatever the temp outside, about 90% of the time it's humid here.
Thanks for the input folks.  I'll post more later.