This is not a dumb question at all.
One major brand name is Fan-Tastic, the other is MaxxAir (what we have) by Airxcel.
They both manufacture an excellent product thermostatically controlled, automatically opening and closing lid, rain sensor, 10 or more automatic speed settings, intake or exhaust and remote controlled. Or, for the budget conscious a basic fan with 1 - 3 manually adjustable speed settings and manual lid.
There are also some lesser known brands on the market.
2013 RAM 3500 Dually Longhorn
2014 Trilogy 3650RL, W/D, Onan 5500, 8000# Axles, IS, 960 Watt Solar, 6x6 Volt Battery Bank, Freedom SW 3012 Inv/Charger