Water line size question

What size of pipe should I have for the main water line servicing 15 trailers with 2/2 configuration?

Plumbing is generally sized by the number of bedrooms and/or bathrooms. F&T could probably give the best answer if you can track him down. I would guess roughly 1.5" to 2". What size do you have? Please do not plan using my educated guess. Consult the water company first

Other factor come into play such as static pressure, dynamic pressure, length of run. Does it run uphill? Etc. etc.