On Mon, 10 Jun 2019 06:14:02 -0700 (PDT), wrote:



Until you get a local ground electrode out there I would be careful
bonding anything. It is best to drive 2 rods 6 feet or more apart.


Ground rods alone are not a good substitute for the the 4th ground WIRE.

I think you need to run the 4th wire so the safety ground is WIRED.

Even the best ground rod is many ohms

m

True but the code allowed you to use the neutral for a ground until
the 1996 cycle was adopted and there are plenty of 3 wire feeders,
dryers and ranges out there.
In the case of a second building you always need a ground electrode
and even on those old ranges and dryers, the manufacturer's
instructions suggested a supplemental grounding wire. In those days it
went to a cold water pipe. Now that it is becoming rare to find metal
pipe, that doesn't really work.