They have probably extended the chassis thoughJust looked back at the previous posting by donnkim and see he is buying a Chausson with a Ford engine, and it is an auto. Firstly, the brochure says that the dealer will give more information on towing weights. Secondly, donnkim has bought the auto version, and this is limited to towing 750kg either braked or unbraked, unlike the manual Ford. The CoC does give these figures.
Much depends on whether the OP can prove he told them he intended to tow, and what he was going to tow, though I do wonder why he did not get an explicit towing figure from the dealer before buying. If all this was done then, as I pointed out earlier, the CRA is quite clear, he has a right to reject:
10 Goods to be fit for particular purpose
(1)Subsection (3) applies to a contract to supply goods if before the contract is made the consumer makes known to the trader (expressly or by implication) any particular purpose for which the consumer is contracting for the goods.
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(3)The contract is to be treated as including a term that the goods are reasonably fit for that purpose, whether or not that is a purpose for which goods of that kind are usually supplied.
However, just to add to the confusion, the Ford 350 skeletal chassis single cab 170bhp auto has a towing limit of 1800kg according to Ford. Wonder why the Trigano group say this is only 750kg????