We currently own a 2003 Tiffin 37 ft Allegra Bay gas motorhome. We will be downsizing and are researching the class C 28/30 ft motorhomes. However, we noticed there is only one a/c on all size class ...
We own a 32' Motorhome with 2 slides and find the single, 13,500 Btu A/C adequate. Ours is ducted. When it is above 90 degrees out, it does seem to run often.
If you camp often in open areas with no shade, you will probably find your A/C running almost constantly, but it should be able to keep the camper cool.