Hi Lynda,
The Chile, Argentina and Brazil main tour is indeed fully booked but there are still a couple of places available for the main tour with add-on.
In total there are 19 travellers booked, 17 on the main tour, 2 on the add-on. The group is made up of 7 men and 12 women with ages from mid-40s through to mid-80s.
If you ask me again closer to departure I can let you know if there are any more travellers booked on the add-on.
Kindest regards,
Julia