Oops, my mistake! I was thinking of the aluminum-body Avion trailers.
I stand corrected.
Um, maybe I was half right to start with... a google search of Avion 35M pulls up a 35 foot Fleetwood product from the '90s. it appears to be a fiberglass gelcoat stick-built trailer. Hmm, I wonder if there was any manufacturer-relationship between the vintage Avion eggs (which I had forgotten about) and the later Avion stickie trailers? Or maybe Fleetwood simply bought the rights to the name or something?