I think you have a really cool setup going there; it looks like a fine way to haul a lot of gear.
My first thoughts were "man, I should put together something like that". But, then, the other side of my personality kicked in, and I started thinking about whether I would want to call attention to myself in a "bug out" scenario. I am afraid that if it came time to get out, I would spend too much time trying to decide if I really wanted to haul that much stuff with relative ease, or if I really didn't want to call attention to myself as "the guy over there with the cart loaded with goodies".
So, there's a lot of things I like about what you've put together there ... but, my own character/personality has me struggling as to whether I would actually head out with it; or would I end up wasting more time trying to par it down to what I could carry on my back. (?)
I will have to try to think this through some more.