Optimus Prime skin for Peterbilt 389 truck American Truck Simulator Mods | 14 Feb, 2016 Skin mod for vipers peterbilt 389, works with all parts, opens at level 1, costs 1 dollar, Author: Richthofen20 Tags: Optimus PrimeHaving trouble with the mod? Check the comments for a solution and report any new bugs you find.