When parking a vehicle that does not have spring brakes, you should use chocks
a) To keep the trailer from offtracking so much
b) To stop the trailer from jackknifing
c) To help the trailer go more quickly
d) To keep the trailer from moving
Answer: d) To keep the trailer from moving
If the answers is incorrect or not given, you can answer the above question in the comment box. If the answers is incorrect or not given, you can answer the above question in the comment box.