Mod WESTERN STAR 6900 XD VERSION 1.3 for Spintires V03.03.16

Added a trawl (from where the truck came from).
Carries your cargo 4 points (tractor).
Carries and conventional equipment.

- Changes in weight, suspension, acceleration. Acceleration is slower. It goes smoothly, hard, softly;
- Made lighting devices;
- Minor changes in the cabin;
- Changed the color.