Traveler's checks -no prob at all, it's personal checks a CM may look at you funny. As far as IDing for them goes -CMs aren't told to ID for them. The ID is the matching signature itself. That's why the person who signed them in the first place needs you use them. Same goes for credit cards, if there signed on the back technically they aren't even suposed to ask as far as visa and mastercards go -it's in the contract terms however for the most part they'll be accepted regardless. Make sure to carry an ID if you're going to use anything like the last two, and a major credit card as well for a PC that is one place where the CM can't bend