I knew I could justify buying multiple bags. I did not spend much time organizing so you could probably load them better if you were not just doing to post pics on a forum.
one bag (cart):
two bags (cart + stand - you would have to take long sticks out to fit in the cubby):
three bags (2 x cart + stand). This is obviously not practical for passengers but posting for reference with the seats down:
You could probably very easily lay the three as I have them shown above and lay long sticks sideways in the cubby’s or diagonally across the bags so that the rear seat can still be used. I just thought of that as I am posting this.
Just another data point but took my Model Y on a golf trip with 4 dudes. Fit 4 bags and 4 carry-ons for the weekend. Took the drivers out and just put them on top of the golf bags once everything was loaded.