Ratty, I think you have been mislead. You need to ask if the fault is with the caravan will they still recover you and I am sure the answer will be no. To be frank I would check the length point with the policy as I am not sure the answer was correct.
In addition only the two clubs give you double recovery which means if you break down on the way to a site they will take you there and if the car cannot be fixed during your stay they bring you home again. In addition if the caravan is on site and you are away with the car and a problem arises they will take you back to the site and recover you back home. The C&CC cover is with the RAC but is a far more extensive policy than the one they selldirect as is theCC one Mayday which is with Green Flag. I am afraid that outside of the two clubs the breakdown policies available can leave you with a very expensive problem and I cannot suggest anywhere else you can go.