You act as if this is the first time a truck manufacturer changed the dimensions of the box... It isn't. The big three manufacturers have been changing box configurations on a regular basis since 1987.
You're expecting a 7 year old camper that was designed for a different generation of truck boxes, to fit a brand new configuration. It always takes the camper industry a couple of years to catch up to the new truck box dimensions.
If you think this was bad, go find yourself a camper made in the 1990's and try to fit it in that truck. Better yet, find a 1980's model.