To be able to progress your complaint  towards a replacement,  I suspect  will be quite difficult.  History  shows it is very rare for a caravan manufacturer to accept that a caravan needs to be replaced under the term of the manufacturer's warranty.  They normally seek to repair where a liability is established under the Warranty.
You are  more likely to  (but  still not  certain) to  be offered a replacement if you  use your statutory rights under the Consumer Rights Act  2015. However there are  specific criteria that  have to be met and it  has to be conducted in the correct way.
Just in case you  don't know,   the CRA sets out  the minimum contract conditions that  a retail purchase has to meet,  You  contract is with the seller  not the manufacturer and the seller cannot use the manufacturers warranty or opinions to modify or reduce their liability to you under the CRA.
Basically your case all hinges on being  able to show the caravan is faulty, Obviously forum members cannot  confirm if that is true or not,  but provided it is less than 6 month old from the date you took possession of it (completion of purchase contract) then it  is actually up to the seller (not the manufacturer) to show the caravan is not faulty. If you have had the caravan for more than 6 months, then the CRA requires the customer to provide the necessary evidence of a fault.
But If it  is your intention to use the CRA you must  formally reject the caravan by letter to the seller and notify them of your intention to pursue the the matter under the terms of the CRA .
You will find some great advice about  how to use the CRA on the consumer associations web site (Which?),  along with some proforma letters of rejection etc.
If you  used a finance package to purchase then the Finance company is the seller and they carry the liability.