Overnight charge (say 10 hours) will deliver 25KWh. At ~30p domestic rate would cost £7.50. Even if the charge is £9 it is still a fair deal. Stay longer leave with 50KWh +.
Motorway services - park van, drive a few hundred yards to charging point, fill up, collect van go. Apparently standard practice for EV owners towing sheds. Simple.
The real benefit is that unlike a solitary EV, if charger is broken or in use you can stay the night - probably not the preferred solution but better than sleeping in the car until repair man cometh.
BTW - I am neither an EV or caravan owner. I may buy the former at some point, but the latter seems unlikely having tried it many years ago.
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MG5 review 
MG5 review 