Does anyone know, or is anyone aware of a resource that tells us how the R1T body is constructed? Evsecifications.com shows R1T body materials include steel, carbon-fiber, and aluminum. Which parts are made of which material? My main curiosity is what material is used for the roof. I tend to use a lot of magnets to rig camping / awning gear. In lieu of being able to examine or test the real thing, I am trying to anticipate where my magnets will work.