Trailer pads were wired at my deer camp over 15 years ago. The main power pole has meter with 200 amp disconnect. From the meter a 3 wire service was run overhead to each pad. At the first breaker box it is grounded with ground rod. All the other breaker boxes just have the 3 wire service to them. All breaker boxes past the first one only have 1 ground neutral bar in them. The ground and neutral wires are all bonded to this single bar. I need add a new breaker box so I can add an RV 50 amp 4 wire plug in.
Should I separate the ground neutral wires in the new box and do I need to put in a ground rod?