Who really knows what to believe on this issue? For all we know the OP is stating fact as he knows it.
And why would someone come on here to disparage a specific model trailer? Makes little sense. Could be the OP was hoping to warn potential buyers of this potential problem, not looking for grief. All the responses l have seen so far have not disproven his allegations.
That said the claims do beg the question as to why the dealer does not drop the line or at least the model if this problem is true. Surely he can't be a sucker for punishment.
Best anyone interested in this particular model can do is ask the dealer about the issue, inspect closely the models on the lot, and monitor the Keystone forums before buying. One thing that is common to the OP's post and fla-gypsy's post after his visit to the Keystone forum is the apparent lack of satisfaction from the manufacturer when it comes to leak issues. Maybe that is the take-away.
Just my 2 cents.