The one thing which I've found towing in 100+ degree temps in Texas is how very hot it gets in the closed TT.
Temps over 140-150 are common when I open the door after towing for three or four hours.
The fridge temps can rise too high and food gets spoiled.
It takes three to four hours to cool the TT down to near 80 with 50 amp power and both ACs running full blast.
That said - I try to never tow at night.
When we have to move in that Texas heat - I try to get on the road near dawn and be at a destination by noon. Sometimes that doesn't help much with nighttime lows near 95 degrees.
But sometimes that just isn't possible and we deal with it.
One other thing I've seen in those temps is tire temperatures above 120 degrees.