Peterbilt 389 Viper Skin Pack for ATS American Truck Simulator Mods | 7 Feb, 2016 Viper skin pack for Peterbilt Modified v1.11 for ATS by Viper2 and v2.0 by AMT. For all types of cabs. Author: Skiner Tags: AMTATSPeterbilt ModifiedHaving trouble with the mod? Check the comments for a solution and report any new bugs you find.