Question Doubles and triples are: Answers More stable than straight trucks. Most likely to turn over due to the "crack-the-whip" effect. Easier to drive than other vehicles. Less likely to be affected by wind than other vehicles. Explanation Double and triple trailer combinations are more likely to turn over due to the "crack-the-whip" effect than are other combination vehicles. Drivers must steer gently when pulling trailers. Take a FREE Practice Test Now