I have towed 20K lbs on the Colorado front range with the 40tow with no temp problems I use the 80 DD to haul my 3500 lb trailer when its empty all the time too..
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DJ Phoenix (my modded) Hi-1200/240Tow/75FS/80DD/100/140SS +Minotaur
ASE Master Auto Technician 
2001 Ford Excursion 7.3 4x4
Projects. 1970's Hustler and Max II Amphibious ATV's
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