Just wondering what kind of temperatures all your a/c units in your truck are running at max cold.
I think i feeel pretty lucky- driving in temps of 91 deg. my a/c was running 38-36 degrees at the driver side duct by the window
temps run about 48-50 on normal a/c.
Oh yeah, it's a 2002 ext. cab.

 

48 at the center vent for me on normal. Hardly ever set to Max even in the 100 plus degree weather we are having.

 

A/C depends on humidity and Temp. Roughly it will cut outside temps in half.

 

In Tennessee it ain't the heat it is the humidity