Geep,
Everyone on wants a Fan-Tastic vent fan in the TnTTT, right? Well, I've heard good things about their 12" portable 12v fan also.
Take a look at this Camping World link, http://www.campingworld.com/shopping/it ... -fan/38132 especially the user comments. Lots of air movement and very little amperage draw. I think it is a deal for the price and plan on getting one myself before camping again. I'm sure it can be had cheaper (thriftier?) through Amazon.com
Up to 900cfm air movement. By my calculations, based on truss sizes of 7' tall, 6' wide, 13' long, you have 600.5 cubic feet inside volume. That means it could move all that air in the trailer every 40 seconds.
Mike in FL