PTS - 4 Autoload

Version 1.1 was intended to be used with GaZ 53 truck and some people have experienced problems when using the trailer as a standalone mod (without the GaZ 53 truck). In version 1.2 I have changed the autoload script and now there should be no any problems when using the autoload function on the trailer when the GaZ 53 mod is not used or even installed.
Special thanks to the Polish mate who tested the version for me!
No other changes were made on the trailer.