if you're looking for more overall cooling, I'd look at a portable a/c unit, which you can then plug into the separate 15/20amp outlet at the campground - this would give you additional cooling, maybe in the bedroom, if that's where you need it, versus trying to 'upgrade' your existing working unit for something that probably won't make much noticeable difference...
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The Turners...
'07 Rockwood Signature Ultralight...
two Campers and two Electric cars : )
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