Thanks everyone, great detailed info and makes sense to me. I will look into the divider, etc. for sure for some improvements and continue to dump as much as I can directly out the AC rather than ducts. With my AC units being at extreme opposite ends of rig I think I am really gonna struggle to get much cool air flow to the living room even with fairly big fans but sure it will help some. I am glad it was mentioned the 3rd AC on the 420 is in the loft (another
) as I was thinking they would be smart and put it where the fan is in kitchen/living area. I agree I would try and have a third added there with no ducting. Its looking to me like someone "over thought" the AC locations on this model and simply decided directly over beds was the key as otherwise no other logic seems to apply. Its gonna be 120 on Phoenix and still over 90 where my trailer is at this weekend so will get to try it again.