If -on the 737- one wishes to apply rudder trim IN A TURN (obstacles) after Engine Failure, it does not seem as easy and straightforward to precisely do it and then verify if the aircraft is properly trimmed. We know that in straight flight we should have a levelled control column. However, proper trimming during turns is not as clear (control column position, bank angle, turn rate, etc.). Would like to hear your thoughts with regards to such factors (control column position, turn rate, bank angle, etc.) Thanks!