You have coupled a trailer with a box body . It has snowed heavily in freezing temperatures . Why do you have to clean the roof of the trailer from snow and ice ?
The wind could loosen snow puffs and endanger vehicle drivers who are following behind
The airflow could cause sheets of ice to loosen and endanger vehicle drivers who are following behind
The high load on the roof could cause the trailer to tip over
When braking, sheets of snow or sheets of ice could come loose and damage the towing vehicle