Bas,
A little strange to write to you in English lol
For the trees: easiest but more time consuming is to get rid of the old ones and replace them with trees from a more recent xpack
Bomen dus weggooien en door die uit de nieuwere xpack vervangen, de transparente instellingen zijn niet goed
Driveline: you need to select every track sequentially in order of passage
iedere track in volgorde van doorkomst aanklikken
Try to build your own xpack specific to this track, this will reduce the filesize drastically, maybe you could add in some real Belgian textures like roadsigns etc
Probeer je eigen xpack te maken voor alleen Goolder, daarmee wordt de download kleiner (wil ik evt ook wel voor je doen)
If you have questions, shoot, and I'm sure there are more people willing to help you (and they know more then me
)