I really like the looks of the old Macks. How hard are they to work on? Some vehicles are better designed for maintenance than others. I would suspect that a Mack would be easier than most.

How hard is it to get parts? There are several places that carry 'new' parts for Fords or Chevy/GMCs, but I've never run across a similar site for Macks.

195? Chevy 3800 dump truck
1973 Chevy C30 cab and chassis
1987 Suburban 3/4 ton 6.2L Diesel