The Kerbals call this thing “The Tripod” this reusable Munar lander is capable of delivering a surface payload of about 16 Tons. The Tripod’s Truss is very versatile for payloads of all kinds, even very large mk3 payloads and deliveries with wheels.
The NMC docks to a fuel depot in Munar orbit. Payloads are brought to the surface from 60km, the crane returns to a 60km orbit after each delivery, and returns to the depot. Repeat.
Designed as a three stage program. The first flight put a mock crew module on course to flyby duna, and then brought it back to Kerbin, testing the engines and the artificial gravity cabin.
The second flight sent a crew of three to Duna Orbit, and returned them to Kerbin safely. The third flight launched an autonomous lander-base to Duna orbit to await a crew. The Forth launch sent a crew of 4 to Duna orbit, and later to the surface.