This isn't really surprising to anyone that pays attention to cars. The safety innovations of the 90s (crumble zones, etc) added a lot of weight, and cars have just gotten a LOT bigger.

The Accord, for instance, gained almost 2 feet in length and 6 inches in width between the late 80s and today.

Of course, the trucks were smaller back then too - The Ford Ranger (1989) model weighed only 2800lbs.