BAK RollBak Tonneau Cover that fits 2nd Gen Dodge Ram with a Short Bed.
Brand new still in unopened boxes.
This cover will hold over 400lbs so you could stand on it without hurting it.

$600. Sells for $990 from BAK and other retailers. Local pick-up only (Southern California).

Here is a YouTube video of this cover from the BAK website.
YouTube - ROLLBAK Retractable Tonneau Cover