Gonzo, are you aware that moot court teams compete against each other by going through mock appellate cases? There is no trial in an appellate case. Everything is argued from the record that the trial court made, there are NO witnesses, etc. Moot court isn't going to help you become a trial lawyer.
Also, trial lawyers learn to be trial lawyers on the job, not in law school. There are "mock trial" teams but what they do is usually pretty overdramatic and removed from reality. Like I said, you learn on the job, not in law school.