Western Star 57X for ETS2 v1.3

Changelog v1.3
- Added new 6x2 and 6x4 chassis with adaptation to the euro trailers

Changelog v1.2.1
Fixed bug with skin WS 57X.

Changelog 1.2
- a new version of the roof fairing (Aero II);
- version of the headlights without heating;
- a new version of the lateral fairing (Aero II);
- optional double vertical exhaust pipes;
- Added the accessory "Christmas garland."