Thinking about how should I ever get an opportunity to actually play this game I'd really like to play a Trade Caste Character, but then had to think for a moment about the kinds of 'Adventure Types' mentioned in the book and some are more suited to Lower Castes than others
Serving a Lord seems to be mostly for Sunborn and Holy Caste as there isn't much reason for a Groomer or Baker to go on adventures for his or her Lord seems 'Peasants to Heroes' (With Trade Caste being a more upgraded version of Peasants) and Survivors of Destruction' type plotlines offer the most 'equal opportunity' for any character to step up and prove themselves regardless of Caste
Serving a Lord seems to be mostly for Sunborn and Holy Caste as there isn't much reason for a Groomer or Baker to go on adventures for his or her Lord seems 'Peasants to Heroes' (With Trade Caste being a more upgraded version of Peasants) and Survivors of Destruction' type plotlines offer the most 'equal opportunity' for any character to step up and prove themselves regardless of Caste