I know it has been a little while since any discussion on the frame modification issue, but I remembered we have a Freightliner sticker on the driver's side visor. It does specify what the truck's wheelbase was from the factory.
Mine as you can see is 275", exactly what the 2014 TS model was advertised by Jayco. But I wonder if there is a difference in the numbers on the models that appear to have the splice?
2014 Seneca 37TS
Toads: 2014 Ford Explorer Sport or 2013 Ford Focus ST