Lipperts warranty on RV frames
http://www.lci1.com/Service%20Warran...%20Chassis.pdf
I think if you go to the main site and search around you may find that they do build frames that will support the goosneck...The trailers I have seen that sre goose neck are beefed up considerable in the front area. We have some folks in our local campimg group that have horses and their goosneck trailer is certainly different that my 3400. But again..folks have pulled fifth wheels around with a goose neck hitch, Pull overweight do all sorts of scarry things for years..without a problem.