modular display rack systems , which are easily configurable , have interchangeable components , and are capable of being packaged and shipped in small containers , are described . preferred methods for using modular display rack systems are also disclosed . in some of the embodiments disclosed , one or more ladder racks are used to erect a single tower modular display rack , a two tower modular display rack and so forth . each ladder rack used to construct the modular display rack system may include a support base pivotally attached via a pivot pin to a lower portion of the ladder rack . the support base supports the load of the ladder rack and the modular display rack system and also pivots to a folded position if desired .