[Fyron]

Those self-sustaining ships in your fleets will share supplies with the others. It is quite handy to build supply tankers that are filled with solar collectors and supply storage components.

If you wish to get bases joining fleets, you can edit the setting in Data\Settings.txt that controls this. It is towards the end. Make sure to do this in a custom mod folder, however, so as to preserve the original form of the data files. This is necessary for multiplayer play (unless everyone has the same mod, which should still be in a mod folder anyways), as well as handy to have a ready to use backup of the stock data just in case.