[SoCalBoost]

I've searched a lot on this topic and I just can't figure out what to do or try on my truck.
I have 2013 crew cab short bed 2wd, 3.55 gears, rated for 9800 lbs. It has always run just under half on the trans and coolant gauges when empty.
Last month we bought our first travel trailer. It weighs 5800 dry so it's probably about 6500-7000 as it sits now.
Towing to a local campground which is a curvy mountain road with a 4% grade my trans and coolant gauges went about 7/8 to the red, at which point I pulled over for a few minutes. The gauges both went back down to half and I continued on my way. The reading on the trans was 240 at its highest. The outside temp was about 100, and the a/c was on.

The trans is running around 195-205 when empty. When loaded on the freeway, I have seen it get to around 208-212 on the display, but still show half on that gauge.

I'm not sure what to do at this point. It seems like if something was wrong, it would do it all the time, not just when towing. Is the truck overloaded considering the grade and the ambient temp?
Thanks.

 

[SoCalBoost]

Also, truck is completely stock except for a K&N intake. I also put 91 in whenever I'm towing.

 

[SoCalBoost]

So mine does have the auxiliary trans cooler. I talked to a guy at my local Ford dealer and he said there was no difference between my radiator and trans cooler and the max tow version.
I was in drive with tow/haul mode on as well.
Also I agree that the a/c is adding a little heat, and a little load, but i just feel like that shouldn't be a problem.