I would not use RCP. I recommend using a lined DIP or PVC. Pour concrete ancors or caps to prevent floating. Also are you installing any manholes in this 400'?
I work for a construction company who installs water mains and I just recently installed a few ARVs. You can go back later, if determined that an ARV is needed, and install them using a tap and wrap-around. An existing tee is not needed to install an ARV.
Hope this helps you out a bit.