Sorry Reno, no offense intended, I was just a a loss for a better word for the assembly of cabinets around a complex service arrangement like that.
I have heard it said that the whole assembly is the service for the purposes of where you ground the neutral and it may actually happen more than once. Typically meter bases bond the neutral in addition to the MBJ we install.
Is this the meter from the utility or a private meter from the park owner? I agree with the opinion above, utilities don't usually let you get at connections on the line side of their meter without breaking a seal. They may not want fuses in there that you have to access.

This is from the handbook, although not exactly the situation you have you see there are multiple places where the neutral is bonded.

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Greg Fretwell