Do you ground your Inverter genset?

Sparky, I've had my Yamaha 3000 for 10yrs. I did use a flimsy ground a couple of times but quit. I've ran mine in the rain, on the ground, on a rear mounted tray, in the bed of the truck, even power to 3 trailers. In other words how ever I needed to supply power for the job at hand. I use a plastic tarp and PVC poles to keep it shaded and dry.

Do what you think but a good ground depends on soil type and moisture content. 8' rods are the recommended but I don't think I could pull it back out of the ground if used one that long.