The MG5 takes about 60 kWh, and the manual quotes 29h 7m to charge fully from 10A.
If charging on a 3 pin plug you need to be confident that your outlet and circuit will take sustained high throughput without the circuit catching fire somewhere along the line. I'm not sure I'd trust a campsite 13A socket - even home wiring sometimes proves inadequate.
I'm not sure there is a standard practice for EV owners towing sheds as it's only relatively recently that EVs actually capable of towing anything sensible have really started to take off, though your scenario seems a good idea. However I can't disagree with Z that the impact on range would be likely to put many off in the first place.
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