The TrueOS people still need to add proper service management and a decent service management toolset.
I suggested to them back in January 2017 that since OpenRC has s6 integration, they might do well to add s6 to that to gain full service management. I never received a reply. I haven't heard that Laurent Bercot was contacted, either.
* https://news.ycombinator.com/item?id=13458186
* http://www.mail-archive.com/supervision@list.skarnet.org/msg...
I personally use the nosh system and service managers on FreeBSD and TrueOS, of course. I just wrote up a more detailed account of how I used them on TrueOS to run the PC-BSD desktop login and chooser utility under proper service management, and to improve several parts of that subsystem.
* https://unix.stackexchange.com/a/390089/5132