Plumbers don’t carry massive heavy plant. But I know you were just picking a concrete example of a business there so let’s not dwell on that particular case. The real point is that if a business causes damage to the roads that has to be repaired, it should contribute an appropriate amount. If that makes the cost of doing business more expensive, that just has to get passed on to the customer - who, ultimately, is the one having the heavy stuff transported
It would have a massive effect. Transport (car) emissions are one of the larger - and growing - sources of emissions.
And we can’t hide behind “But the corporations…” because ultimately what they produce gets used by us.
So to answer your question: riding a bike when Global Capital wants you to keep buying cars and pumping oil into them is one of the best acts of defiance you can make