any bearing distributor will be able to supply you with wheel bearings. you are not restricted to caravan dealers.
The part number is etched onto the side of the bearing as you can see from this picture
The caravan repair man has taken the drum away to get the correct bearings. He reckons that the last bearings fitted just last year were the wrong size as they were both completely destroyed.
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.