Re: Shocking question !
I would check your extension cord carefully.
Use a voltmeter and check for voltage at the ground terminal. Use a metal water pipe for a ground reference.
Open any added cable ends (molded on ends should be good if it is a UL or CSA or TUV approved cable) and make sure a single strand of wire isn't connecting the ground and hot terminals. Or the ground and neutral either, since there is no guaranty the outlet or extension is properly wired.
If that checks good, start checking the van. The 120V connections in the van could have the same issues as the extension cord. Unplug from shore power, turn off any inverters and ohm out the shore power connector and any 120V outlets.
Usually 120V wakes you up, but it rarely kills. 240V hurts a lot more and has a better chance of doing you in. 480V and above make me very cautious.
Another way to check it, would be to turn off the power, connect the shore power, ground the van (jumper cables frame to water pipe) and turn on the power. This may cause a minor explosion or fire, so it is not recommended. But, it will find a hidden short.
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