I have the 13.5 and to be honest have had it sitting in the Sun all day only way to cool it down on really hot days is put the ends in.
The sun hits the whole unit and warms the ends they intern warm the camper, so the AC is working really hard, 15K isn't going to be much more help, if you can fold the end in that is in the sun all the time it helps a lot.
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2016 F350 Supercew Short Box 6.7 PowerStroke Diesel
2013 Crusader 295RST Touring Edition
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