I was just over at my wife's construction trailer, powered by one of those 36kva generators. They have a 4 wire feeder into the trailer. the gen set is bonded and they have 2 ground rods. The trailer frame is also somewhat grounded by the 16 tie down anchors screwed into the dirt.
For the purposes of insuring there is no difference in potential between the trailer and the generator I think the EGC in the 1/0 feeder is doing a great job. Who cares if it is not "ground" as compared to the sales trailer a quarter mile away?
Now if they strung a LAN cable between them we would have a problem. They are letting Sprint DSL deal with that.
