Fan
I have had the Monster dual fan #290 set up on my truck for about 3 years. These fans have a adjustable temp screw. A/C is connected to the compressor with one wire, I have very cold a/c in the summer. The nice part about the control box is the fans come on at 60% and go up to a 100% power if the temperature continues up another 10 degrees. You can also wire a switch to turn the fans on manual or off. Very user friendly. The most I towed combined weight with this set up is 14,000 with no problems.
I am removing my Monster fans for another experiment, the first $225 gets them. Sam