Haul mark Trailer Defective materials and will not return emails or phone calls to resolve the issues Nationwide

I have a 2004 homework enclosed trailer 18' x 8' that the roof caps on the front of the trailer is made of a defective plastic according to a authorized haul mark dealer   The cap has four cracks going across the top.  I have tried emailing them twice and I have left 3 messages by phone in the past week and a half and still no one has contacted me.  This is soppest to be a top notch big name company that charged way more than a small company by advertising the best materials far from it.   Beware when you buy these trailers your paying more then they are worth