I'm really sorry guys, been extremely busy lately
I've just tested this on a new layout that I've been fiddling with. The layout is using the S&C 1960's region.
As a test, I added my DMC-12 traffic vehicle to the traffic via the map's config. kuid:103475:29000
That's what went into the config.
This was under TS2010 SP2.
It did appear in the traffic, however it may be a little while before your chosen car does. Of course, remember to have traffic turned on.
The converters are not an automatic thing. You must convert each traffic item to a traffic style asset (actually a trackside object), otherwise it will not show in-game. It is for this reason that I made the tutorial, and the converters. You need to create a new asset, referencing the originals, which is then referenced by the region/map.
Hope this helps.
Zec