I have wondered what you get for the $175.00 External Fridge Fan. Is it an after market fan system which goes on and off whenever the fridge cycles on? Is this an easy add on later if it is needed? Will I save propane using it? Does it work on both propane and 120v usage of the fridge? I'm in Colorado and don't plan on getting the Air Conditioner option either. I would also have the freezer stuffed with the reusable ice blocks.
Things may have changed since my 2014 model but my fridge had the optional Texas Fridge Fan, which may be the same as the external fan.
A small boxer/computer fan mounted to the back of the fridge for extra cooling, it exhausted in the up position. It came with a thermistor on/off switch as well as a manual override, also at the back of the fridge, that you'd throw if it was hot.
I use the past tense as it was removed from my trailer when swapping to the double door fridge.
Price sounds about right, mine was a $150 option.