2016/2017 Montana Insulation & A/C Question

Does your unit have the extra large returns for the A/C units? I believe that is one of the changes that started mid-year '16. Several have no complaints with those units. Others have had crushed ducting that contributed to the problem. The fact that angers me the most is that the Sandpiper I sold to my work partner's daughter was parked next to us in Myrtle Beach this past summer and that unit stayed perfectly cool while we were unable to keep the unit at 8* below ambient air. Yes, both in full sunlight all day. That unit is stark white while our unit is the new beige. So a little color variation and ours has no black on the nose, only the slide toppers. I truly miss the rapid cool of the older units. I'm one that doesn't care if it was a little more noisy. Another thing that was upsetting, was in June we went to Wisconsin and had a friend of mine with my EXACT unit sitting beside mine and his cooled great. That' part of the reason it is going back to the factory. No one can explain what is happening around here.