Binds to the tail domain of the KRP85/KRP95 heterodimer to form a heterotrimeric kinesin-II complex and may regulate the spindle vesicle targeting of this complex. Heterotrimer of a 115 kDa subunit (KAP115) and two kinesin-like subunits of 95 kDa (KRP95) and 85 kDa (KRP85).