All campsite's 16A outlets should be protected by a 30mA RCD which is sufficient for the intended use. Although there is nothing wrong with an additional one it is a bit pointless spending out for it.
By the way, are you sure it's a 10mA rated one - they are quite unusual ?
Something like this may be better then the whole of the extension lead is protected if you are somewhere were there is no rcd protection. I'm a great believer in looking after your own safety where you can.
Why should any caravan have a RCD when all camping sites also have to have a RCD on every outlet.
We all know why. Because not all sites follow the rules.
However where to install is another matter. Near plug would protect the cable but likely would get wet but at the socket would likely be inside the tent and although it does no protect cable it does protect the user of items plugged in.
Seen them used on building sites and they were a real pain. Mainly since the generators had an idle function when no power is drawn and when the generator went on idle the active RCD dropped out. However we had no problem with water ingress.
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