I know this is an older thread, but wanted to add some info in case others find this thread while searching for information (like I did). It is confirmed that East to West Alta travel trailers have actual 2" sidewalls and double Azdel with vacuum lamination. Grand Design uses pinch rolling lamination and luan.
On fifth wheels, East to West Ahara uses Azdel walls with vacuum lamination (146 tons of pressure for 16 minutes) with 5/8" tongue and groove plywood floors and roof decking while Grand Design uses pinch rolling (80 pounds per square inch for the amount of time it takes to go through the pinch roller) and luan backer with OSB floors (unsure on roof).
East to West Ahara gives you 6 point hydraulic auto leveling and hydraulic slides on the main deck with a new design cable slide on the bedroom slide. Interesting thing they did with the bedroom slide is, they left the bed BASE as a hard mounted fixture. ONLY the actual bed deck plywood moves on rollers on top of the beds base. Why? Because it greatly lowers the weight of the bedroom slide putting less strain on the sidewall and motors. The greatly reduced size of the cutout for the bedroom slide means a much smaller hole in the sidewall which means you don't hit your head when you walk under it. AND, because the sidewall hole is smaller, less stress on the sidewall means East to West does not crack the sidewall in that lower left corner and put a trim piece over it. Ahara comes standard with 3 AC units with a low draw so you are able to run two of them on 30 amp service! When you run all 3 on 50 amp service, they are not power controlled, they are able to run all 3 compressors at the same time. CRE3000 suspension with wet bolts, reinforced hanger brackets, on and on.
It has taken me MONTHS to dig up all this. There is so much wrong information online. Alliance uses pinch rolling and foam core floors in their Avenue fifth wheel. I had to find videos shot in their facility and industry interviews with their plant manager to nail down that info. It is crazy. Anyway, I hope this helps someone down the road.