This plugin is maintained by the BakkesMod team.
RotationTrainer is a tool to build sequences of checkpoints for the player to drive through. It doesn't only need to be for rotation training though: you can set up sequences for workshop maps like Yoshi's Island to time your laps.
All RotationTrainer files are stored in
/bakkesmod/data/RotationTrainer/. In that folder should be a list of the default checkpoint codes you can use, and a picture showing where the checkpoints are on the field. If you look in the
/Sequences/ folder at
_Example.cfg you can see the checkpoints in action. That file also has a thorough description of the different checkpoint types. If you want to make your own sequences, read that file for instructions.