Spare parts in trailers

Real truckers in harsh conditions always have few spare parts with them.

Added the ability to transport parts in those trailers where there are boxes.

An unresolved issue with the display of the number of places for cargo in trailers in the store, but the loading and quantity are saved unchanged.

BONUS:Also, the archive contains a file of a low two local trailer, modified to transport three goods. ! warning! ver. beta

Mod is designed for manual installation. Installation replace the appropriate files in your archive initial.pak