Provided is a vertically adjustable support device for scuba equipment, which attaches to the rear of a vehicle via a hitch receiver to allow the device to be raised or lowered to a convenient usage height for the diver. One implementation includes a vertical support tube that provides a rigid structural support for other components of the scuba tank holder apparatus to be joined to, a slideably joined holder carriage, and a hitch receiving member; in which a first end portion of the hitch receiving member is joined to a lower portion of the vertical support tube, and a second end portion is configured to be operable for being securely joined to a vehicle hitch, thereby structurally supporting the vertical support tube and associated components when joined thereto.