Not sure about that extra four feet. I would talk with the dealer. We have the 3910, 40.6 feet, we do have two ACs, but have been in some 100 degree temperatures and been very very comfortable.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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