This a tutorial on configuring your avatar to work with Snail's Trailer Renderer Marker for VRChat's Avatar 3.0 SDK, using a toggle system. The toggle system holds many advantages for this, and I feel is ideal. This tutorial will also help you learn interactions between toggle system and gesture based events for handling other tools similar to this marker.
This video is no longer relavant to the Marker. We now have a script that will do all this for you! This video will tell you how to set that up:
https://youtu.be/1qQeAHo_KaM