Ok, we are really wanting and shortly ready to buy a jayco expanda outback - the 17.5ft with toilet/shower & bunks. Probem is we are concerned about the capacity of the heron 2.2 over getting the heron Q. How effective is the heron 2.2? The manufacturers say that the 2.2 is not recommended for pop tops, but Jayco install them - don't know why. Also, there is roof v's cupboard location of the air conditioner. Can anyone advise of their experiences of air conditioning effectiveness in an expanda. Cheers