I will add my .02
Mack camelback is a off road suspension. I never understood why mack kept pushing to sell it to all buyers use when most other truck builders pushed their buyers to air ride. Air ride is not just better for driver comfort but it also dont beat the truck to death either.
The E7 in my opinion is limited to a vocational engine by todays standards. they were reliable but once the E7 moved to electronic they were just gutless . thats probably why they were so reliable becase they were weak on power and thus seam to last longer. sure they will do the job but just not as efficiently as a big bore cat or detroit can. "no replacement for displacement"
The cab over parts will pretty much be a junk yard hunt so dont expect mack dealers to be of much use.
If you want a good solid nice truck look at years 2000-2007 Pete or KW. pre emission trucks with Cat 3406 or C13, C15 power. you pay more for a cat but I feel you get what you pay for. parts are still available for both truck and engines and you will be better off in most situations. I love my old macks but I dont think I would ever buy a newer mack. this is after company driving them and seeing how dated they are in the HP race and the difficulties it is to get some basic parts for them. When I drove a 2002 pete it was always a breeze to get parts from the pete dealer. not so much for a 2007 mack.
And someone asked about Gregg Hoffman and his MH. he is still driving it but it has a Cat in it now
I think Ray parked his MH and is driving for Walmart now for the Insurance.
Have a good one