Hmm, they didn't have it fixed as of 6 days ago when I received this email from Jayco after I inquired about the tank less hot water system and the vibration. Here was their response.
Girard has made some improvements on there water heater to be able to get an consistent flow of hot water. I have also attached the latest information from Ford on the vibration issue. BCM 1877 – 2016 E-Series E450 Cut-A-Ways and Stripped Chassis Stretched – Vibration Felt And Heard From Floor 55 MPH To 62 MPH Under Load
Some 2016 E-Series E450 Cut-A-Ways and Stripped Chassis stretched vehicles equipped with a 6.8L engine and 6R140 transmission may exhibit a vibration and moan at 55 mph to 62 mph under load. Engineering is currently investigating this condition and is developing a service repair procedure to be available shortly.Do not attempt repair or replacement of components at this time. Monitor QVM and OASIS bulletins for updates.
But if you drive it and no vibration it's all good!