>>but I would like to ask what were the best and worst car types<<
The worst had to be the R-16 in the 1980's. Nothing could be worse than those cars.
>>IIRC, the R-44's had MDBF's of about 7,000 soon after delievery, but you would certainly be more familair with this than I am<<
You recall correctly.
But, I've read that the R-44's were second worst during that time. The absoloute worst? R-16's. The 16's weren't the best cars when it came to MDBF in the 80's.
Best car? R-32. Why? It's still running. It'll be running for at least another 10 years. For a car to still be running shows 2 things.
1. Budd built the R-32's to last.
2. MK rebuilt the R-32's to last.