I was on the NJTP today, and another driver told me that I could get 15% off on food by showing my CDL. I tried it, and sure enough - it's true. They are, however, changing over to a "card" system that you have to register for. A form can be obtained at
http://www.hmshostcdl.com/
It asks some very personal questions, but it appears as if the card is tied to your CDL - when your CDL expires, the card expires.
Might be useful to some of you who travel the East coast a lot.