Ree-diculious.
There is 10ft of travel in the landing gear? The payload is perched over a trap door????
I posit a better strategy: one 8x8.5 hatch in the side and rollers in the floor so it can be loaded like an 18-round magazine.
https://en.wikipedia.org/wiki/Swap_body These have an unstackable van and are lifted by the lower corners.
Also, airplanes are sensitive to weight distribution. The containers are a standard shape, but the weight could vary. They would have to be ordered correctly.