Gen Y is not in the same space.Goosebox is the only Lippert frame approved "gooseneck" style hook up. The gen-y, the dangerous anderson gooseneck hitch or any other hitch isn't approved by Lippert - for reasons. Brutal HO is correct, if anything at all happens - it'll be catastrophic.
Lippert was going to buy the Gen Y design but because of money instituted their own stuff with Reese. There has not been one denial for using a Gen Y. Not one, unless it was installed incorrectly.
Internet folklore.