Harven's Mack R with Dieling add on get's an SCS Heavy Haul from up on Bellingham mountain to Astoria. The load is a 119,000ib log loader on an SCS Triple Lowboy. The engine is a ZeeMod ENDTB 676 with a "Goggles Tune" in it. The transmission is a 12 speed.
Link below is to a Jack's Chrome Shop video on the history of Mack Trucks
https://www.youtube.com/watch?v=_aEIDAnun0w
10 things you didn't know about the Mack R
https://www.youtube.com/watch?v=misck2q7BEU