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Something that hasn't been mentioned much are the built in slots in the bed itself. I'm assuming this will be compatible with standard T-slot hardware like you would find with 80/20 type construction.
If that's the case then it will be extremely easy to build your own add-ons for all sorts of purposes. Slide out loading, camping, bike racks, etc. I used 80/20 quite a bit in projects and it's amazingly versatile.