Hey, Roly!
What do you have in mind, finish-wise ... mill-finish alum., brushed, polished, or something you can paint red to match the Cruze?
If just mill, brushed, or polished, you can get away with .032" thickness (saving a few pounds), but if you are planning on painting, I'd recommend .040" in white (looks like you've already been given some excellent sources). With all the moldings needed to trim everything out, you'll probably add less than 50# to the trailer.
I've probably go all the moldings you'll need, but we'll need to talk before I can make any recommendations. If you want, give me a call ... I'll be out of town Friday & Saturday, though ... happy to help any way I can, my Friend ...

...!
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