Fanless is great but..........
let me share my experience from a few days ago. I ran last winter fanless with great results. Quieter, warmer, and looks cool when you raise the hood.
However on a rough section of gravel road 2 weeks ago at about 50 degrees, and at about 6000 feet, pulling a steep grade going to elk camp I had to pull over and install the fan to keep temps below 240.
The problem was I couldn't go fast enough due to the road, and with the loaded trailer and truck (about 5k extra) temps got out of hand quickly.
The night before I pulled Monarch Pass which is about 6 or 7% and a few miles long with only minor concerns. I had to slow down to about 40mph to keep temps in check (205-210).
So, my advise is try it if you live at lower altitudes and don't tow.
I'll likely remove mine soon since I'm back in Arkansas.
One observation, it seems that the denser air at lower levels cools better by a considerable margin. Anyone noticed this?
RJR