I was later informed that the trailer was actually built in the Los Angeles factory.
The following article in Trail R News September 1955 also confirms the trailer was built in Los Angeles Ca. -
Since then, I've noticed some small differences between both factories production line finishing in the mid 50's. These are a little less obvious than looking at end panels, wheel arches and s/n's.
Below are a few -
Internal rivet sealing
Out of all the mid 50's CA trailers I've worked on the rivets have been sealed internally. I first noticed this with Wally's #1 trailer and thought it got special treatment, but I since realised it probably was standard LA practice -
56 CA Bubble interior, complete seal -
55 CA Wally Byam Bubble, rivet stem sealed
56 OH Bubble, no seal
Door Gasket fitting
I've also noticed the CA fitted door gaskets with a blind rivet. Expamples below, first the Wally Byam #1 trailer and then a 56 Ohio Bubble