: You can now tune these trailers with various options including colors, rear bumpers, beacons, strobes, and ramps SCS Software's blog Chassis Variants
Version 1.39 brought several free base-game improvements alongside compatibility for all then-current DLCs:
Fully ownable and customizable trailers added to the base game and updated for DLCs like Heavy Cargo Special Transport City of Calais Reskin: A major visual update to the port of Calais. Sound Improvements: New turbo slider and improved cabin spatial mixing. SCS Software's blog How to Downgrade to 1.39 on Steam