I've been to PIT several times in the evenings and selection is usually bottom of the barrel with a nearly empty lot. It's usually Grand Caravans galore. Seems like they run out of cars around 7 or 8 and just start pulling up the vans.
If you get lucky they'll have a handful of big SUVs to go along with the Grand Caravans. Nissan Armadas, Expeditions, Tahoes, Yukons, and the like.