purchased three of the 6000 RBTA FF from Camping World on sale down from $349 at $179 ea with my life member which with the 5% rebate covered the shipping. Cost for all three was $625.18. These included the automatic sensors (open and close) and thermostats with the black tops (life time warranty) as that is what is the color of the bottom of our rock guard and propane tanks now.
Let you know how they work as we are pulling all the old fans out and replacing them just to have them for boon docking down the road. Quite the savings with the discount.