[Route66Rambler]

TSD card is not a credit card. It's an EFS fuel card. TSD extends you the use of the card on their account. You use the card at the pump and they in turn debit your checking account for the funds a day or so later. You can also use the card for a cash advance. The reason they need your SSN (and they will tell you this if you ask them) is in the event they do not get funds from you, they can take action against you to get reimbursed. Many folks have a separate account for the TSD card.
This is a legit trucking company that has been around for decades. They are not out to get your money or steal your identity. They are just trying to reduce their costs for fuel for their trucks. The more fuel they buy the cheaper it is.
They are adding more businesses to their discount network as well. They have listened to the RV community and want to know what they can do to make the experience better.
This is not a scam and there are thousands of RVers signed up. We have used it for over a year. Flawless. Never a problem. If you are scared then don't sign up and don't save money.
If you are content with the few cents you save at Pilot/Flying J then keep that. You can save upwards of .60-.70 a gallon with TSD and that adds up quickly.
If you talk with the nice folks at TSD they will send you a spreadsheet with the stations and the current discounts. They will also answer any questions you have.
They also have a Facebook page-TSD RV fuel card