We had this problem a few years back when we changed our van to twin axle 8 metre one. I asked on here and a few people came forward with ADAC we joined four years ago used them last April and find their service second to none.
Details and more info are on my website as below and the ADAC website as posted above, you may need Google Translate for this website. The problem with the CC and C & CC policies. CC use Green Flag who will only retreive larger caravans through CC. Then we found the price very high needing European Cover. They quoted us about £350 so we took ADAC Partner Plus Package for 98.70 Euro's for a year. Covering Europe and the UK. Same price what ever size, age and has not gone up for over 4 years. Cover is excellent, more than just Breakdown Cover, includes Illness and Accident.