Auto-Duplex and print terms on back

The printer we have is a Lexmark T64x.

I've been given the task to get our packing slips to automatically print the terms on the back side of the packing slip. I was told this could be done (by a user) with a forms card and get it to configure it store the terms and auto-duplex them onto the back of ANY print job.

I've tried searching for details on how to set this type of job up - without success.

First, does this sound right? If so, can someone point me at instructions on how to set this up? If not, what kind of solution _should_ we be looking at?

Thanks!