Electric panel

I purchased a park a few years ago with no real leases in place. Now I have tenants saying I am responsible for the panel box and poles outside of the home. With no written leases or rules in place (other than the ones I have created since then which do not state anything about panels) who is responsible? All the new homes I have had tenants pull in themselves, I have made them responsible and asked them to get their own poles and panels unless I already had one on the vacant lot they could have. Any suggestions?

R.J. Myers, II