you will need the 8 cars trainer... It also probably can done with the SOB trainer (son of the beast trainer)
8 cars trainer:
http://www.geocities.com/jmanderson_200 ... ainers.htm
edit:
in this topic you can get lot of links to custom stuff, hacks and more!
http://www.coastercrazy.com/forum/topic.asp?TOPIC_ID=6213