Unit load AGVs are gradually becoming a common part of the internal logistics of industrial companies, especially from the automotive industry. Most often for handling standardized pallet containers. The aim of this paper is to identify the possibilities of using unit load AGVs for picking cart handling. Unlike pallet containers, picking carts are completely non-standardized (both in terms of construction and size). The possibilities were determined and verified in the form of a pilot project in a selected automotive company. Output of the paper is a definition of critical success factors that will enable successful implementation of unit load AGVs for supplying assembly lines by means of picking cart.