I won't be doing 90s civilian cars. It would take too much time as there are too many.
It would be more worthwhile for me to do a modern civilian mod to update all of the previous decade's civilian cars.
My experience with exporting from Sketchup to Zmod is it messes with the normals. Try flipping any faces that are facing the wrong way and then recalculate normals and see if that helps, plus what he said ^
This will purely be a vehicle replacement. Maybe period correct sirens too.
EMS fleet started. I look forward to doing the ambulances and the EMS GMC Suburbans.