In the question 'Why does one AT-AT have a hole in it in “Rogue One”?' I learned about the AT-ACT, and also that the orange doors open and close.
As we can see in the following picture the closest AT-ACT has its doors shut and they take up a lot of the space of the back of the vehicle. The far away AT-ACT has its doors open but the main section of the doors are nowhere to be seen. With the size of them it seems like we should be able to see at least part of them.
Where do the doors go when they are open?