Another Dealertrack issue

Dealertrack has a feature that only works with charge customers, the ability to add "remarks" that will populate a screen message, ie: "Do not let Joe charge to this account, Use account number 1234" etc.
Has anyone ever figured out how to add remarks to cash wholesale customers, ie: Use credit card on file, will pay by check, deliver to 12345 Main Street. We have a lot of wholesale customers that will not/do not have a charge account and it's almost impossible to remember whom has a card on file. Parts are delivered then it's Oh, I have a card on file. Other than having a sign by the delivery table with a list of customers with billing instructions any ideas. Dealertrack support was useless, I have been asking them to incorporate this feature for several years now, might as well be talking to Buck Fiden.
Has anyone ever figured out how to add remarks to cash wholesale customers, ie: Use credit card on file, will pay by check, deliver to 12345 Main Street. We have a lot of wholesale customers that will not/do not have a charge account and it's almost impossible to remember whom has a card on file. Parts are delivered then it's Oh, I have a card on file. Other than having a sign by the delivery table with a list of customers with billing instructions any ideas. Dealertrack support was useless, I have been asking them to incorporate this feature for several years now, might as well be talking to Buck Fiden.