When negotiating a new rig purchase, the dealer will often provide items at cost to sweeten the deal. A Penguin AC can be obtained jobber for around $450. Labor is less than an hour - the hardest part is to get it up to the roof; I know, I installed ours.
With our satellite dish we are 13' 3". With factory air we would have been 13' 4". Now an inch may not seem that much, but let me tell you that when you go under 13' 5" and you are sucking up the leather in the seat in hopes that you don't hit something, an inch can be a lot - especially when the road department comes along, repaves (adding an inch or more) and doesn't re-measure and re-post the height signs!
JMO...
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