Which part of a combination vehicle is the most likely to turn over? Before you start the test, please answer the question below regarding your insurance status. Without insurance you will not be able to drive in North carolina Do you currently have car insurance? Yes I have insurance. Great, you're all set! Click here if you still want to compare rates. No, I need insurance. Click here to compare rates from our insurance partner. Question Which part of a combination vehicle is the most likely to turn over? Answers The tractor The last trailer All parts are equally as likely to turn over. Explanation In double and triple combinations, the trailer farthest from the tractor is the most vulnerable to rollover. This questions appears in the following tests: Maryland Double