I am a new S owner and I have never charged it with anything but the superchargers and the charger that came with it. In a month I have to take a long trip where they only have 5 J1772 chargers. I have never used them before. I have read these forums and I know you have to use the adapter and they are relatively slow (about 18 mph). Is there anything else I should know? Should I try to find one locally before I go to make sure the adapter works and I won't have an issue? I have a chargepoint card but these are free chargers with no network.