One issue with reporting to Credit Agencies is that they usually try to sell a report contract/services in tandem with taking your trade information.
Experian has a new Delinquency Notice Service - DNS that is ties to data contributions that sounds like a great collection tool tied to your trade information. They send delinquent account a warning message that their credit file is going to get hit with a delinquency and give them x days to rectify the situation. CMA's Account Executives can tell you more about that service.
Depending on the amount of lines you would be contributing to their databases the credit agencies will respond differently.
Dina Amadril, Director of Marketing
Credit Management Association