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Passenger vehicle weight is basically irrelevant. Damage is proportional to the 4th power, so if your road can carry a much heavier vehicle, the passenger vehicle isn't really doing any damage.

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Not all roads are created equally or have equal weight ratings. I'm sure you've seen signs depicting restrictions on certain roads. These smaller roads tend to be owned and maintained by smaller municipalities who are less able to afford upgrades or maintenance.

In any case, point still stands, you're more than "one smart decision" away from having electrified the American fleet of vehicles.

Also the weight penalty is slowly decreasing as batteries get incrementally better.

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