Let me add one more detail to the mix. Before I discovered the shock issue, my EMS shut off the power while the Autoformer was connected due to an open ground (according to the error code). I checked the Autoformer and it was extremely hot to the touch - I attributed this partly to the fact that it was the hottest part of the day with temps in the upper 90s and the fact that I had placed a small trash can over the Autoformer to protect from rain, and it had very little if any ventilation. After I removed the Autoformer, the open ground condition went away.
A few hours later after I had let the Autoformer cool down, I plugged it back in and just positioned it under the RV to protect from rain with better ventilation. It seemed OK until the shock incident.