CDL - SECTION 6: COMBINATION VEHICLES EXAM QUESTIONS WITH 100% CORRECT ANSWERS | VERIFIED | UPDATED What two things are important to prevent rollover? - Correct Answer-Keep cargo as close to the ground as possible and drive slowly around turns. When you turn suddenly while pulling doubles, which trailer is most likely to turn over? - Correct Answer-The rear trailer is twice as likely to turn over. Why should you NOT use the trailer hand brake to straighten out a jackknifing trailer? - Correct Answer-The brakes on the trailer wheels cause the skid -- release so the trailer wheels will grip the road again. What is off-tracking? - Correct Answer-When a vehicle goes around a corner and the rear wheels follow a different path than the front wheels.When you back a trailer, how should you position your vehicle? - Correct Answer-So you can back in a curved path to the driver's side. What type of trailers can get stuck on railroad-highway crossings? - Correct Answer-Low slung units (lowboy, car carrier, moving van, possum-belly livestock trailer) AND a single-axle tractor pulling a long trailer with its landing gear set to accommodate a tandem-axle tractor. Why should you NOT use the trailer