Mentioning me in the same breath as Randy Grubb is flattering. Google isn't giving up much on work-hardening aluminum, but
this abstract suggests the curves for work hardening and creep cross at 1/2 melting temperature (1,221°F (660.3°C)).
Did I mention that one of the advantages of PolyMetal is that it come in 4x8, 5x8 and 5x10 sheets? That means you could make a 5' section with one seam down the center top.
slowmover -- What think you of this:
http://justacarguy.blogspot.com/2015/06/going-in-style-with-camper-and-both.html