My opinion is the back ugly large coleman Mach Air models are very efficient, seem to never fail. The Dometics are so so to me. Service and support from Dometic is sub-par, but they have the lions share of the market today.
Too bad Carrier got out of the RV AC business last year. They had a good model that moved the interior discharged air on mechanical luevers that really made a difference in moving the cool air around in our "tubes". You might be able to find one or 2 remaining on a shelf somewhere, but unlikely.
So, you're really left with Coleman or Dometic. I'd probably get the 15K Dometic with the heat pump, or if you don't need that, get the AC only with the heat strip option.
Kevin & Prim Li
Bandit the Siberian Husky (RIP) & "G" the Min-Pin (RIP)
Cosmo the Custom 2008 27FB Intl CCD
Maxwell the 1964 Globe Trotter
Name TBD the 1955 Overlander
WBCCI # 6155
AIR # 6155
2nd love - 2006 28' Safari LS
1st love - 2004 19' CCD Bambi