Free, always
Put it on the register with its 17 character number. Add photos and a proof of ownership. If it is ever stolen, flag it here and every check on that number shows it. Your name and email are never shown to anyone.
This is not CRiS registration. A touring caravan should also be registered with CRiS, the industry register, for £20.95, because insurers ask for that document. We are not CRiS and we are not connected to it.