A 1966 study by North American Aviation to use the Apollo Service Module (SM) as a lunar logistics vehicle (LLV). It required putting a landing gear on the SM and developing software to land on the moon unmanned.
'It was proposed for use in an unmanned, direct landing mode. The system required the addition of remote guidance and control and a suitable throttling engine.
So-called 'conversions' of the present SM engine really inferred a new engine development, probably of the same magnitude as that required for the LM descent engine. It was considered wiser by NASA's Bellcomm consultants to develop a new pump-fed engine or use a converted Agena engine and take advantage of the superior performance available.
Advantages of the SM Lander were said to be simple mission configuration; straightforward development; and substantial payload capacity at an early operational date (5,000 kg with an Apollo Block 1 SM; 7500 kg with a service module extended in length by 107 cm). Technical challenges included designing the landing gear and throttling engine provisions, and remote guidance and control for lunar landing."
-information from Astronautix: link
This was one of a number of studies and proposals for a lunar logistics vehicle done in the 1960s using existing designs/hardware.