A product display merchandiser includes a tray having a top product-supporting surface with a longitudinally extending channel defined therein. A first sidewall has a vertical portion and a horizontal portion, and at least a laterally inner part of the horizontal portion can slide laterally with respect to the tray between a bottom of the tray and a base plate below the tray. A front end of the tray has a fitting received in a socket in the base plate. At a rear end of the tray, the channel receives a support assembly that connects the tray to a support structure.