Luxe builds a good coach but as Scott said, no way with a 350 Dually. Empty weight real world on that 42 is over 21k GVWR is something like 25-26k and real world prices that you will pay for one is in the $150's.
Vaughan & Tracy 2013 RW 36RL, 2013 F350 DRW CC, 2016 Focus. MorRyde IS, MorRyde pinbox, disc brakes, Comfort Ride Hitch. "Life is to be embraced, Grab it with both arms ! "