Got shocked while washing trailer

[gat75]

My neighbor has a FR Heritage Glenn Lite bumper pull that is just past a year old; (no more warranty). He just told me that he was shocked while kneeling & hand-washing top of RV.

He was washing the alum trim pc that seals the front cap to main roof body.

He furthur stated that he did not get shocked when he had just washed the other roof areas where the other alum strips were located.

He unplugged shore power & finished the job with no more shocks.
Anybody have a clue on what might be causing the problem?

[time2roll]

Has the outlet he is plugged into been tested for correct polarity and ground?

[CA_Traveler]

He has an open ground that needs to be fixed. Could be anything from the pedestal to his rig.

When that is fixed he needs to plug into a GFCI plug which may trip and if so then his ground fault needs to be fixed.