Here is an answer I got from Keystone.
Thank you for clarifying. The GVWR is 6,500lbs. If the legal owner of the unit would like us to investigate this further for them, they can certainly contact us with their VIN and we'll get a review going for them so we can ensure that anything that needs to be reported to NHTSA will be. Thank you.
Having GAWR axles rated at 4400# each invites GVW loads to exceed 8800#. Way overloaded for your trailer. It's not a normal rating for your trailer. Problem is, it's very hard to get vehicle manufacturers to admit to NHTSA that they made an error.
IMO, the right thing for them to do is to replace your certification label with one that limits the installed axles to a certified 3000#. Nothing else would change. The installed axles are, in fact, providing a great deal of load capacity reserves.