To avoid oversized cars becoming a status/dominance symbol, there should be inconveniences they can’t buy their way out of, like special oversized parking bays (possibly alongside those for delivery vehicles) that aren’t in a central or prestigious location. Of course, we live in a free market, which means that the rich are overwhelmingly likely to end up having a roadyacht marina at the front of every desirable location, like first class seats in an airliner.