Older DP or Newer Gas Class A? What would you do and why?

We had an '03 Newmar Mountain Aire for 9 years. I just sold it in May because it was 6 steps up and a problem for me alone. The insulation in that unit was R12 in the floors and walls and R16 in the roof. It was on a Workhorse chassis and after having had a 35' Pace Arrow prior we were surprised we could carry on a normal conversation while driving 60 mph. Not all MHs are created equal. gas or diesel. A cheap diesel could be much louder from road noise than a quality gasser.