Holy mother of god. very paiseh. actually best to return the car either after dinner or next day.
it depend on your discussion with the bride's family. example roast pig. by right it is suppose to bring during actual day so can cut and serve guest, but now days people give during guodailai session. u can bring fruits, longevity noodle. no specific preference.just discuss with bride's family.
some people even give a day before the ceremony.so actual day dont have to bring many things.
very subjective.