Yes, but I was hoping to go to more of a safety/proper installation issue. For example, on the North Slope and other extreme, hazardous locations, what would be an appropriate and sensible installation? I have installed buried ground rings of #4AWG copper around skids but I was never involved in testing. Would this be good enough or just a band-aid because there is no better solution?
If you have permafrost below a seasonal thawing layer, going deeper will not help.
More area will always improve the electrode resistance up to a point where the resistivity distant from the rod becomes a limiting factor.
What are you actually seeing when doing ground resistance measurements? (Using fall of potential or other test?)
It seems to me that in terms of safety, static and lightning protection will not depend greatly on the electrode resistance, while fault current issues will be better handled through bonding and EGCs than through ground electrodes.
If the skids are getting external power, then a good EGC as part of the power feed will matter a lot more than grounding.
If the skids are self-powered, the ground should not be carrying fault current from that supply anyway.
It gets trickier when multiple skids are interconnected by power and control wiring, and especially if they are close enough for someone to touch both at the same time, but ground electrode resistance still does not play a major fault safety role, IMHO.
Answers would be different if you are using MV or HV circuits with earth return.