[Yachts]

I too have had both. My experience is basement airs would cool 422,507,512 sufficiently. 512 was the only one of those that had slides. Depending on how many slides you are getting affects cooling needs. Bill is the best one I know who can tell you about basement airs in a quad. I agree roof airs are noisier. But as Richard says it opens a storage bay. I would be careful about a quad if it has less then than Four roof units..I had one go out and three was having a hard time keeping up..there are a few out there that only have three..