Ours is insured through the Camping and Carvanning Club with Clubcare. I'm afraid I have no idea what you would expect to pay to insure yours - our new Pathfinder has new for old cover on just about everything (including the camping equipment that is not part of the unit), covered for just about every eventuality (including vandalism and storm damage) and covers use in mainland Europe of something like 240 days a year! This level of cover for a unit as new as ours (5* cover) costs us about £280 - not cheap I know, but at least we have peace-of-mind. If you are a C&CC member, give them a ring - you can get a quote for free, if nothing else!
caravan guard want you to keep hitch locks wheel clamps on 24/7 a bit much if you ask me, i have a very secure garage but they still want hitch locks etc on, try bakers of cheltenham much better deal you will get a better price as well.
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SAGIC which stands for Salvation Army General Insurance Company will beat any quote. They have just quoted me £52.50 for my brand new £4000 Trailer Tent. There telephone number is 0845 634 0260