So I have an idea, and I like to think that nearly everything has a solution... so give me your thoughts

@BlackJohn
I'd like to have a back deck on my bus as opposed to one on the roof so that my dog can hang out with me - I like to be outside, and I like to have her with me. (and I know I could bring a chair out onto the ground, but this is intriguing to me)
My thought is to have composite boards as a deck (I think they're lighter, and of course more eco) on the back of my bus with a winch to lower it level with the back door. I made (another) nifty image (I know, a very lame image), but hopefully it'll help me explain.
I realize I'll def need to have 1-2 boards that'll fold down/up to make sure the brake and turn signal lights are showing, plus I might want (or am required to?) have the windows exposed (even though I can't use them bc there will be walls in the way of my view?!)...
But that's why hinges were invented, right? Plus, I believe this would be more aerodynamic than a rooftop deck... better gas mileage but not the rooftop view... which might make it not worth it in the end. (I'm referring to boards 3, 5, and 7)
I'm just playing around with this idea... entertain me