And Now ... for the opposing view:
I recently installed a new service for some spaces in a mobile home park. The plan is: power for one space now, provide for two more.
The PoCo refused to set a transformer and run the new lines for one trailer; with three planned, no problem. I set up a common meter board, a gutter just long enough to feed three meters, and a main disconnect to make the later addition of the two additional meters easier.
Why not install the meter bases now? Because the city has not approved the additional two spaces; there are myriad other issues the park has to address before the next two spaces are allowed.
Well, I just had a chat with the PoCo. This person - who has not been involved until now - was insisting I "secure the disconnect side of the service feed." A phone call clarified what I suspected: their linesman was confused by my putting a main disconnect where there were fewer than seven meters - and was so accustomed to seeing a chain and lock on the disco that he thought it was mandatory!