If the neutral is bonded at a second location away from where the grounding electrode conductor and the main bonding jumper connect, then there needs to be another ground rod driven and another equipment grounding conductor applied to the bonding jumper at the second location, just as if you were feeding a sub panel with the grounded conductor and the grounding conductor are run with the feeder. In the 2002 code book look at 250.32 for clarification. Although the pedestal does not constitute a separate building the intent is that for each point where the grounded conductor and the grounding conductor are bonded there is a separate connection to earth. What might be acceptable is to connect a separate grounding electrode conductor from the panel in mobile to the existing ground rod.
