Found this. Even though the outside walls are probably wood, the fact that the Vacuum Bonded must count for something? Are there any other TH's that even offer Vacuum Bonded Walls?
As with all Tesla models, the T3950 is built with EverGreen’s DuraLite double-welded aluminum frame in the walls and floor. Tesla’s outer walls are built with EverGreen’s signature vacuum lamination process while the inner walls are built with long-lasting, durable ComposiTek. The six-point Level Up leveling system is another standard feature that makes unhitching and re-hitching hassle-free.