A node may include a receiver configured to receive signals transmitted from a gateway and a logic device coupled to the receiver. The insulation sleeve includes a large-diameter insulation sleeve at the lower, outer peripheral portion of the conductor bar, and a small-diameter insulation sleeve surrounding the outer peripheral portion of the conductor bar except for the distal end thereof. The flow ratio control system has a first and second passageway, where the ratio of fluid flowing through the passageways dependent on a characteristic of the fluid flow. Using the gimbaled HCTs to control the momentum associated with the reaction wheel assemblies results in minimal HCT gimbal stepping. By supporting the assembly by both an attachment to the hitch receiver and supporting the assembly on the down folded tailgate the assembly can support more weight and at greater distances and angles the previous bed extenders and ramp combinations. The tissue removal devices that may be used include rotatable blade devices having flow control surfaces that may be inserted into a vertebral disc and rotated to pulverize the disc material and facilitate its removal.