It pays to shop around, the CC is good cover but pricey. We are with Alan Blunden aka Cover4Caravans who we find fine and not inclined to annual increases in premium. We have also used the Camping and Caravan Club in the past and there are folk on here who use Saga.
No doubt there will be other recommendations.
Decide on the replacement cost, the contents value and accessories value (awning etc) and get a few quotes, its all pretty standard depending on the age of the van.
One thing, its worth checking if the vans contents are covered by your house contents insurance.
Good luck and enjoy Saturday.
Charlie