Ready for something a little tougher? This Pennsylvania CDL Double/Triple Trailers Marathon is a gargantuan practice test that contains a mix of all 60 questions that we have available for this PA endorsement. If you make a mistake, we’ll remember that question and will display it to you again at the end of the exam 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”. Good luck!