Heavier cars don't make much difference to potholes. Trucks, poor road construction, poor maintenance are the contributors. Studies show that heavier vehicles are more dangerous to others though theconversation.com/big-cars-mig...

Big cars might make you feel safer. But here’s how vehicle size impacts others in a crash

We’re seeing more big cars on the road. What does this mean for safety?

Plus of course the heavier a vehicle the less energy efficient. So weight based car tax is probably a good idea to incentivise people away from large SUVs in urban settings. Clearly incentives also needed to keep us moving towards greener electric cars too.