The present invention relates to an adjustable height table base with a transport mechanism, and in particular to a transport mechanism selectably operable in a grounded position, a low transport position and a high transport position. The table has a base that is adjustable in length with a crank. A top is supported by a table frame, which allows the top to be locked in a horizontal or vertical position. Four legs can be provided each having a pad at a distal end. A transport mechanism is also provided. The transport mechanism has a caster assembly with four casters and has an extension assembly that is extendable along its longitudinal axis to move that table between the grounded position, low transport position and high transport position. The extension assembly is operable under force of gravity and used by lifting or tilting anywhere radially about the table at selected distances.