The present invention provides methods and systems for performing in-vivo flow cytometry to obtain desired information regarding one or more cell types of interest flowing through a subject’s circulatory system. Each elevator has a rear power and control connector and hitch which connect to complementary connectors and hitch located on a table shuttle mechanism by remote actuation. Further, one or more additional signals, separate from the communication link, may be used to indicate when to take action after the power management message has been received. The flexible cover material is secured to the rear window frame and a tailgate cooperates with the rear window and extends between the two lower ends of the rear window frame.