A casket system includes a casket container and a height adjustment mechanism. The casket container has a bottom, a head end panel, a foot end panel, and rollers supported by the bottom. The height adjustment mechanism includes a threaded shaft, a worm nut, and a crossbar. The threaded shaft extends at least partly in the vertical direction. The shaft is rotatably coupled to the casket container proximate the head end panel. The worm nut is rigidly secured to the crossbar. The worm nut rotatably engages the threaded shaft and translates rotational movement into axial movement along the shaft. The crossbar includes spaced-apart extensions extending from an edge thereof away from the head end panel. The spaced-apart extensions are configured to contact and engage a casket insert that is sized and configured to receive a deceased. The axial movement of the worm nut causes the crossbar to move vertically with respect to the head end panel.