New Zealand Law
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Under the Consumer Guarantees Act you have strong rights in this situation. If this was a major defect then you are entitled to return the caravan ask for a refund. If however it is something which can be easily repaired, then you are entitled to have correctly repaired. The issue of whether there is a long-term problem is something that will give rise to your right to return the caravan and ask for a replacement. I suggest in the circumstances that you get someone independent with expertise, such as a builder someone specialises in caravan repairs, to look at the caravan to see if there is a major problem. If it has been correctly repaired then although the seller has to pay for all costs of repair, then you would not be entitled to a replacement. If there are more fundamental problems, then you could insist on replacement. However there is no reason why you cannot ask the seller for a replacement saying that you have lost faith in the caravan being fit for purpose. You should certainly ask and see what they say. If you would still like a phone call after reading this answer please let me know.
Yes, it is additional service, an extra from the first fee
But you can ask further questions here if you prefer which comes under the first payment