I like the idea, but not sure about velcro, and if it did stick you still would have to limit the weight of what you stored there. I've used some heavier duty velcro to hang a small flag and it is marginal at best. Have you seen @Dalehelman 's door storage mod? They hold all sorts of things very well! Good luck!
2017 T@B 320 Max S silver and cherry red, L@dybug ("Bug" aka my esc@pe pod), TV 2015 Toyota Highlander aka Big Red
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https://www.amazon.com/dp/B00JHKTDMA/
2013 CS-S us@gi
2015 Toyota Tacoma PreRunner Double Cab