That is a bummer!
Just a thought though, unless you are wedded to that new car smell and unless the accoutrements on the '19 far outweigh those on another truck like the one you want (2500), you might be able to score one with 10,000-20,000 or so miles on it for enough of a price difference to consider ordering your new camper with that as a "Starter Fund" for it. Then by the time it is ready, you might be able to have put aside the rest of the cost of the new camper?
They do show up from time to time and were often never taken off-road or beat to death. I got my F-250 that way when an older couple opted to move to an RV from the 5th wheel set up they had.