Caravan Club - cheapest, didn't ask loads of questions about the storage facility, only required one clamp, gave discount for attending a CC manoeuvring course, and discount for having a higher excess. Also caravan is insured on the open road, for at least one insurer that was not so. I was surprised how the policies varied between companies - whatever you do read the details before buying.
We have just had renewal notice from WISE, which we thought was really good. Especially when we compared it to CC and CCC, who we feel are quite expensive. But, as mentioned elsewhere, look at the small print, after many phone calls and internet quotes we found park home insurance good value.
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we have ours with caravanwise we went with them last year when we had a folding camper and changed the insurance over when we bought the caravan it was cheapest that we found. someone told us to try nfu but they wouldn't even give us a quote because we hadn't had insurance on a caravan for more than 5years