When we bought ours the 15k btu unit was an option that we chose, thankfully. While 1,500k increase doesn't sound like much it is a 9% increase. We don't have any issue keeping cool in 90+ deg heat but I wouldn't want to take it to Dallas in mid summer.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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