Which part of a combination vehicle is the most likely to turn over? Do you currently have car insurance? Insurance is mandatory to drive in Ohio Yes I have insurance. But please show me your best quotes. No, please help me find the best insurance. 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