Sad sight - but my advice would be to cut out Salterns entirely - try and deal directly with their insurers and /or the loss adjusters.
Repair costs I am sure will be more then 2/3 of the hull value . ( I assume it was their trailer ? ) .
My 'feeling' is they will 'deflate' the repair costs to ensure its not written off - then inflate the warranty repair costs ( which I assume gets passed back to manufacturer? ) then fix it as cheaply as possible and hand it back you ......