We have a 2003 Beaver Monterey and it has 2 A/C units. It's 40' and the LR area does not cool in warm climates enough. We have purchased a portable A/C unit to help, but we are now looking at new Fleeltwood's for a trade. We are interested in the Discovery 40X, but cannot find any with 3 A/C units. We are not familar with the A/C units in Fleetwoods. Are 2 units enough or do we need to move onto the 40K that has 3 units?