Hi there Seasoned,
It would appear that you aren't the only one thinking ahead -
For Experience South Africa there are 17 travellers booked, 9 on the main tour and 8 on the main tour with add-on
And for the Brazil, Chile and Argentina tour there are currently 8 travellers booked - 7 on the main tour and one traveller booked on the main tour with add-on.
In terms of seat preferences, we recommend that you request this at the time of booking so that a note can be added and when our team come to reserve the seats, these requests are considered. It is worth noting that the team do try to accommodate our travellers' requests, however your preference is not guaranteed.
Kindest regards,
Julia