I think Diamond Reo is still around.
http://www.t-linetrucks.com/ found this one wiki-.
Latest go at it!
As far as Mack goes, get ahold of Dennis Slagle, executive vice president of Volvo Group, Yah the same guy on undercover boss fame.
Kevin Flaherty is president North American sales, for Mack.
Ron Huibers is president Volvo North American Sales.
Cheer's, Neil.