I bought a Greystone 29MK last March and immediately found that the Seating Technologies sofa that came with the trailer has serious design issues. When it is opened the head end of the bed is 3 inches lower than the foot end. The dealer has tried working with Seat Tech several times and the only change they could recommend ends up tilting the seat forward when it is closed up, making it very uncomfortable for sitting. They are not offering any more help at this point. Do you have any suggestions?