Your thread title should say where you want to convoy from and where you will convoy to.
the thread body should have the time you are leaving and the convoy route.
Then people who want to join that convoy should reply to the thread if they can join at the start or on the route.
People who are not on that route but want to convoy should start a new thread with details like above but with there start point and route.
If all convoys want to meet at a destination close to the final one so a bigger convoy can be made, then that needs its own thread also
the thread body should have the time you are leaving and the convoy route.
Then people who want to join that convoy should reply to the thread if they can join at the start or on the route.
People who are not on that route but want to convoy should start a new thread with details like above but with there start point and route.
If all convoys want to meet at a destination close to the final one so a bigger convoy can be made, then that needs its own thread also