ok I have the 15000 btu ac in the front of my fr3 thirty footer and planning on installing a 13500 in the rear if anyone already has done this --- how does it cool the coach in real hot weather with both ac"s running. would like to know how one 15000 and one 13500 work or.... if you have both 13500 , how do they work in really hot weather 95-110 F. ?? I am planning on only using the 13500 with the 15000, but if someone has already don't this and it is still not desireable , maybe I will get a 15000 for the rear to go with the front one. I would rather not be "overkill" on this installation.