The excessively elevated coolant temperatures of the Jeep Wranglers are designed that way for EPA reasons to reduce emissions. It doesn't matter to the EPA that these super hot temperatures cause the engines and transmissions to prematurely fail.
Here is a memo from Chrysler, Star Case S1324000004:
"Engineering has determined the gauge is reading higher than design intent. If this is the customers
complaint, review the below operating parameters. This condition is being investigated by Engineering.
Some customers may comment the temperature gauge appears to read hot or above the half way
point in its travel. The thermostat is designed to open at 221F, resulting in an Engine operating
temperature of 230F."
I SERIOUSLY doubt anyone's Wrangler runs at 208 pulling a trailer. Hmmm...
Here are some of 100's of examples of complaints of Jeeps running hot:
"I recently purchased a 2015 JK. I have less than 100 miles on it. I noticed the temperature on the (EVIC?) said 226 degrees at idle. The fan seemed to kick on and it started to go back down. Is this normal? I looked at the needle gauge and it was in the middle. Please Help!"
"My new 2016 JKU Hard Rock is routinely showing 222F in normal driving with only 80F temps. Not sure what it will show when it gets hot."
"Saw 224 during stop and go driving today. And it wasn't even 75 out. It seems to fluctuate from this as a high to about 205 as a low, once fully warm. What gives?"
"Have seen exactly what you're seeing in the wife's '14. Was idling while she ran into her parents one day last week (65° ambient) and saw it hit 224°. Have seen high 190's-212° while driving. We've got the intermittant water pump bearing noise so I didn't know if they were connected or if this little 6 just runs warm."
"Mine still seems to run hot. After driving for hours, and stop and go will spike the temp to 226+. Did some moderate hill climbs and saw it hit 240 and 3/4 on the gauge. That scared me! Yes the fan came on and cooled things down, but I had to stop just a little way up the hill."
"Just got a call from the dealer. They say everything is fine. I checked coolant levels just this morning before I drove it there. Explained that when it got real hot, 240+, the overflow bottle got really high and did not go down after cooling. They tested the radiator cap and said its fine too. They have no explanation for what I have experienced."
"It just worries me. A vehicle that can easily reach 226 while idling with no load, can also easily overheat when working hard it would seem. I know I have seen temps of 240+ (3/4 on the dash gauge) when climbing mild hills and I have to stop before things get worse."
"Well, I've hit 242 and no light yet. On long hill climbs this sucker gets hot fast!"
"The idiot light will come on at 267, so you are OK at 242. I drive my 2013 Rubi every summer for 3months/15000miles Overland Expedition offroad and on highway and on long hills in UT or CO I get 239 and then it cools down little bid. My operating temperature is between 222-228 on straight highways. You can't listen to members who drives it to work and back for 30minutes each way with no hills!!!!"
OK...that's enough examples.
BE CAREFUL AND WATCH YOUR COOLANT TEMPS VERY, VERY CLOSELY WHEN ATTEMPTING TO TOW WITH A JEEP WRANGLER!