Hello Darrell.
I strongly suggest you seek professional guidance about this process from a solicitor, CAB or Trading standards.
you need to establish who has actually sold the caravan to you. This may sound strange but if you have used hire purchase with the caravan as collateral through a finance house or bank, then technically the finance house or bank is the retailer. If you used an unsecured loan or your own funds, then the caravan dealer is the retailer.
May I assume that you did not order a defective caravan?, therefore why did the retailer supply you with one? Quite simply they shouldn't. The caravan is faulty either by design, materials or workmanship and thus does not meet the retailers obligation.
Write to your retailer and tell them about the defect and 'reject' the caravan. Instruct them to replace the van with one without defects or refund in total for the caravan. Invite them to comply with this instruction within a reasonable period such as 10 working days.
This process is strictly between you and the retailer has nothing to do with the manufacture. The retailer cannot use the manufactures delay as an excuse for not complying.
Do not accept a repair unless you are absolutely sure it will not affect the structure or value of the caravan. If you do consider a repair then insist on a full 12 month warranty on the whole van from the date of completion of the repair.
manufacture.