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Is not a Hydro issue, you are just dealing with different potential.

I would start confirming the neutral connection at the service entrance panel is solidly connected to a grounding electrode.

I would then, confirm the neutral and bonding wire at the trailer panel are not connected together, either by a wire jumper or by the green screw at the bonding bar. CEC 10-208 (1) (b)

I would also take a look at the wiring of the load being fed from this sub-panel, any possible leakage?

if stray current is still there, then I would drive a grounding rod by the trailer CEC 10-208 (1) (a); the idea is to stablish equipotential.

Any fault will follow the path of less resistance, no need to worry if it will go back to the shop.

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