All the gens used at a golf tournament had 2 grd rods each bonded to the neutral buss at the main. These were 70KW to 2 MW units feeding everything from a 10x10 shade cover to 50kSF membrane structures.
We utilized some portable units, mostly for 120 volt power used while we were working. No ground rods for them.
I used a 6500W portable at my home for 18 days, grd from twistlock to my main panel. Backfed CB, LOTO on main CB.
