Mack Ultraliner ATS 1.28.x.
Tested on: ATS 1.28.x. (DOES NOT WORK IN PREVIOUS VERSIONS AT 1.6.x).
In this update:
Buy it at PETERBILT dealership.
Adaptation to 1.28.x ATS game version.
Clean gamelog. No warnings.
SiSL Megapack addon available.
Custom license plate addon available.
Enjoy this. 
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