Have you thought of having the door open in the opposite direction. It would tremendously increase the utility of the box. It would be vastly more accessible from the outside of the truck with the tailgate down and with the tailgate closed it would still be accessible from the inside. I am interested both as a potential customer and from a tinkerer / design standpoint.
Thank you, and excellent question.
I went through both options in the design phase and this is what I found:
When the tail gate folds out it facilitates using the lid as a table/place to put things removed from the box while trying to get the buried things out.
The lid can also open fully, regardless of what is in the back of the truck, like drawers, a fridge, other cargo.
For those that have drawers in, outward opening allows the drawers to be partially or fully opened depending on clearance even if the tailgate is open.
When the tailgate is closed, the latches are in the downward position and anything that bounces around in the tailgate is not likely to inadvertently open the latches, and if for some reason the latch is not fully closed, it is less likely to swing open since it has to fight gravity to do so.
On top of those things and probably most important, is ease of manufacturability. If you look at the box you will notice that the inside corners have more of a curve to them than the outside corners, by putting the hinged edge on the top/outside I can run the hinge into a square corner rather than have a floating termination that would be somewhat weaker.
Now as you have stated, this format limits opening the tailgate lid while closed. After thinking about it, I felt that this was actually a good thing because in all likelihood if the lid was opened when the tailgate was vertical, anything stowed within would most likely come tumbling out.
I could also not think of many situations where you would be inside the truck and still even be able to open the tailgate, most instances there is something in the way of the door swing, like bedding if you are sleeping in there.
I have also found that one other nice thing about the opening direction is that when laying in bed (on the drawers, which block the tailgate) if I drop the tailgate and reach out, it is very nice to have the lid open away from me in that situation.
And as far as limiting access by opening toward the user, without the scale of a user it may look like it would be in the way, but the lid only protrudes into the user space about 7" (there is overlap on the tailgate itself). Minimum comfortable standing work distance will be approximately the length of the users forearm, not many users are likely to have a forearm shorter than the 11" lid so I doubt that it would be found to be in the way during normal use.
Does any of this answer your question/address your concern? Like most decisions it really is a toss up, but I have tried to think out the problems and present the best solution.
