Thanks!
It was actually pretty easy...
Rough guide:
1. Use new autouid at
http://rigsofrods.com:8080/ to make a clean copy
2. Open skin in Photoshop and color->white (not completely trivial on the Strider, but easy on the Skyline)
3. Open truck file in editorizor to get roof nodes
4. Ref/X/Y would be front-right, rear-right, and front-left
5. copy lightbar from another car so I can get the position right
6. put in beacons, spread out across the right axis
Yeah, it's a little more work than that, but that's really it. Took me about 15 mins or so for each of the two...