Certainly. That's one way, but also poorer people own older cars.

An argument that rests on equality should support the idea that all people deserve the same car irrespective of how much money they have.

Equality would be to be able to go where you need to go, in reasonable time, cost and accomodation, regardless of class, race, gender or disability. Focusing on cars is over-indexing on one potential solution.

People want to move around. Cars are only one way of doing so.