McGrath RentCorp engages in the provision of business-to-business rental services. It operates through the following segments: Mobile Modular, TRS-RenTelco, Adler Tanks, and Enviroplex. The Mobile Modular segment is engaged in modular building and portable storage. The TRS-RenTelco segment includes operations for its electronic test equipment. The Adler Tanks segment includes containment solutions for the storage of hazardous and non-hazardous liquids and solids. The Enviroplex segment involves the classroom manufacturing business selling modular buildings used primarily as classrooms in California. The company was founded by Robert P. McGrath in 1979 and is headquartered in Livermore, CA.