> Big SUVs aren't even very common anymore. They got replaced by sedans styled to look like SUVs (aka "crossovers").

A 1990s Ford Explorer weighs around 4000 lbs. That was considered big at the time. A current one is a couple hundred pounds heavier, a Ford Edge around the same, Toyota RAV4 or Honda CR-V a little less but still almost 4000 lbs. By contrast a 1990s sedan was generally under 3000 lbs with ~2400 lbs being pretty common.

The main difference isn't that SUVs got smaller, it's that sedans got bigger. A 1989 Honda Accord was ~2500 lbs, the 1990s ones were ~2800 lbs, the current ones are well over 3000 lbs.