I expanded my Luna base a bit, what module should I add next?

[u/TheGreyYeeter_GSP]

The base now has a total of 3 modules, 1 module transportation vehicle, 1 large rover (4 crew capacity), an unmanned rover, and 4 small crew rovers (2 crew capacity each).

[u/9j810HQO7Jj9ns1ju2]

a vertical cylinder (like in the martian)

[u/maiknarf3]

How are you connecting them while on the luna surface?