John - are you saying the riveted walls hold up better in the heat than the smooth exterior walls? I assume a min thickness of .040 but even with that, and say a black exterior, don't the panels rip through the rivets in the heat/sun loads?
Yes Sir = Never see that happen.
However, we use a super very expensive two sided tape (Similar
to what holds Space Shuttle tiles on) as well
as screws to hold the Aluminum segments together.
Also be sure 3/4 Plywood on the Floor on 16 centers
if you can find it. I prefer tongue and groove.
Again, Get a Minimun of 6000 Axles: better 7000 Axles
Load range E Radials. 16 inch if you can get them.
A lot of trailer are not built to accept 16 inch (Fenders too small)
so best to get them on the trailer when built.