Bailey have confirmed that they are taking the van back to repair late Sept and we can use it until then...I had a look underneath and after two days stationary the edges of the floor underneath are still very wet ...is this normal ?
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It would appear the caravan has recently been towed, so the underside of the floor will inevitably show signs of spray from not only the caravan tyres but also the tow vehicle, consequently you cannot make a clear conclusion just from the pictures you have posted, however the preponderance of dampness along the majority of the caravans edges does suggest water is possibly emerging from the bottom of the walls.
You ask is it normal? You would hope the answer would be " no" but sadly due to the caravan industries failure to to use proven quality assurance processes to prevent incorrect assembly of their caravans, far too many caravans do leave the factories with inherent faults. So the answer has to be sometimes yes sometimes no.
I concur with the advice you have been given. If you used any form of credit facility to help purchase the caravan, apply the CRA and go for a full refund. However if that is not an option for you, then at least the manufacturer has offered a repair, take it, because the caravan will be worth more than it is now.
You then at least will have a working caravan, but you will have to decide if you want to trade it in against another caravan, or is it better the devil you know, and keep it.
A caravan that has had a damp issue is always going to have the fact hanging over it, but without a doubt, if the damp has not been repaired, the caravan will deteriorated more quickly if left in repaired, but if a full good repair has been made, it's very possible the caravan will out live it's siblings.
You have to hope the manufacturer applies better control over such repaires than they do in normal construction.