Ready for something a little different? This Tennessee CDL Double/Triple Trailers Marathon is a gargantuan study tool that contains a compilation of all 60 questions that we have available for this TN endorsement. If you give an incorrect answer, we’ll remember that question and will display it to you again at the very end of the Marathon until you’ve answered that question correctly. In other words, the Marathon will cycle through your missed questions until you answer each one correctly. You must make a 100% to pass. We suggest you attempt this one after you have practiced the state’s “regular” tests, but before the “Exam”. Give it your best shot!