The first new caravan that we ever bought was insured with the Camping & Caravanning Club on a 'new for old' policy.
This meant that if the caravan was destroyed or stolen the full amount that we paid for it would be covered, plus extras such as the awning, tv and everything else used in the caravan even including the wheel clamps and hitch-lock.
Unfortunately 2007 saw widespread flooding and the riverside site that we were on was flooded and so was our brand new three month old caravan, we were devastated!

We contacted
Club Care, the C&CC insurance organisation, and they immediately removed all of the worry and stress from the situation.
Their assessor arrived within a day or two when the site was accessible, he declared our caravan and everything in it a total loss so we were sent a cheque to replace lost equipment within a very short space of time and invited to visit a dealer of our choice to choose a brand new replacement caravan of the same value as soon as we were ready.

(As it happened we decided to add extra funds and upgraded to a fixed bed twin axle end wash room model from the same manufacturer)
The C&CC couldn't have been more helpful and I have no hesitation in recommending them.
They are not the cheapest but neither are they the most expensive, and we have continued to insure with them since and would never consider changing.