Animal Transport tandem for Rjl

Animal tandem combination wich is based on ekeri tandem addon by kast.

only working for scania rjl and r4

tested on 1.38 also works on 1.37.

required mods:

-rigid addon for rjl by kast

-ekeri tandem addon

-ekeri semitrailers

-rjl scania v2.2.4 +fix