Workbook, Heavy Duty Truck Systems, 6E
Chapter Thirty-Three – Answer Key
1. Technician A says that fiberglass-reinforced plywood (FRP) trailer walls are heavier than
aluminum but tend to outlast aluminum. Technician B says that aluminum sidewalls are
cheaper than FRP and, therefore, are more common. Who is correct?
2. Which of the following statements is true?
3. Technician A says that when the floor rots out in a unibody van trailer, the frame strength
is reduced and the vehicle should not be driven. Technician B says that a damaged door
post in a unibody van trailer reduces the frame strength. Who is correct?
4. What does the term reefer mean?
5. Which of the following trailer types would be most likely to be used to haul aggregates?
6. Technician A says that the difference between trailer-specific tires and tractor tires is that
trailer tires have a shallower tread. Technician B says that the difference between trailer-
specific tires and tractor tires is that trailer tires are lighter in weight. Who is correct?
7. Which of the following is true of trailer inspection maintenance?
8. Which of the following are benefits of trailer-specific tires?
9. What type of dump trailer is designed to handle the toughest hauling jobs?
10. Technician A says that most current reefer units are designed for R-134a use. Technician
B says that unlike automobile refrigerants, trailer refrigerants are more environmentally
sound and can be exhausted to atmosphere. Who is correct?