Pack trailers Heavy Cargo for Russian open spaces v5.0

Pack trailers: Heavy cargo for Russian open spaces V5.0.

- Advanced coupling.
- Steer axles.
- Cable support.

Update 5.0:
On the new version, the old trailers gave an error. Models of new trailers are taken from the Big Heavy Cargo Pack V1.27-1.28. And converted to a new version of the game.

Test version 1.35
Authors: SCS, MOROZOV