A counterargument would be that cars cause basically no road damage and it’s all caused by trucks. Studies have put the damage of a single truck at weight limit in the US to be equal to that of 9600 cars[1].
A counter argument is that we have a lot of road capacity for all the cars. I agree that heavier vehicles should pay a greater share, but we don’t have eight lane highways just for trucks.
Does most of the damage to roads come from the vehicles driving on it or other things like temperature fluctuations?
Driving does a lot of damage. While temp fluctuations cause damage, it is nothing compared to what a vehicle can do.
One of many hidden handouts to favored industries.