As noted in our above post. We generally do not plug in if there is good sun, i.e. not raining and not parked under trees since we have sufficient solar. We did not plug in the last 4 or 5 weeks coming up the west coast of Mexico after I got badly shocked from very dirty outlet at Playa Azul.
When we do plug in, even in US, we merely plug a 15 amp cord to a 15 amp outlet and use that to charge the LFP battery bank (in both Roadtrek and 5th wheel). The power then goes to cabin via 4.0 kW PSWI for AC and 12 V from battery (Roadtrek) or 48 V to 12 V converter on 5th wheel.
This does not mitigate ungrounded pedestals. Older son agrees with idea of grounding the frame of RV. We shall be emplacing a cable onto the frame in one of the bays so that we will then just pull out cable and pound in stake. He suggests an insulated cable so that ground does not occur elsewhere, such as through our hands.
Reed and Elaine