The blue one above, a 1948, was a show trailer for nearly a decade after being featured on Flippin' RVs tv show on the Travel Channel, and was the very first vintage travel trailer to show at the SEMA Show 2015 in Las Vegas.
Even BoMonster digs the Royal! https://www.facebook.com/theBOMONSTER
The model featured four rooms and a shower bath. The US Army purchased thousands of these models as base housing for the enlisted men and their families. This trailer was designed by William Bushnell Stout who also built the first all metal airplane in the United States and started the first regularly scheduled airline in the United States.