So long as you all stay out of the deep South or desert West in summer I'd imagine any of those split systems will work.
On a trailer like mine, from 28' on up in size, a pair of A/C units is practically mandatory if one wants the interior to cool to below 80F. My next trailer will be a 32' or 34' and conversion to 50A service with dual roof A/C units is a given. Aero fairings will be on the list to investigate (around here is an example shown). I just need to find a tin bender who'll work with me.
As my roof will also have solar panels, an antenna farm, plus the usual assortment of vent openings, I've decided not to worry over a "clean" roof but to minimize the drag of each component as I go along. Utility will count over the small FE gains.
I would think a removable boat tail for a TT would trump all these roof concerns given a production model RV. Same for a nose cone of some sort.
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