This is all we have: https://github.com/RigsOfRods/rigs-of-rods/blob/master/source/main/gameplay/OutProtocol.h, but I guess you could easily expand on it.
Automatically enables the debug mode (required for showing vertex indices without additional plugins)
Correct axis orientation during import / export
Better preservation of the existing truck file
Better automatic beam sorting
Better beam group names
Fixed some typos