'88 e250 class B and I love it. 351 Windsor engine with the C6 transmission. Easy to work on. No computer. Parts are plentiful and cheap.
I've got two roof vents that circulate the air pretty well, as well as a couple 12v fans that keep me relatively cool in the summer.
Now Bernadette has a furnace and a urinal.
3 gallon bucket for emergencies.