MANY_MANY relationships in plugins I replicated what was mentioned here: (Plugins: Managing Related Records)

However I'm not seeing any new table created to on plugin install.

I have a "LeaderRecord" with

'trips'     =&gt; [static::MANY_MANY, 'pluginexample_TripRecord', 'pluginexample_trip_leaders(tripId, leaderId)']


with the same relation defined in a "TripRecord", am I missing something to have the tabled created?

Thanks!
Craft won't create the join table for you when specifying a MANY_MANY relationship.  You'll still need to manually create a record for that join table.  See Craft's own craft/app/records/UserGroup_UserRecord.php as an example.

What it will do, as mentioned in the answer you linked to is keep the data up-to-date in the join table without having to specifically reference it in your queries.