Is there a mod or a part, or anything, to make a folding door (i'm not sure if this is the right name for it)? I want to create a big truck that can carry a rover inside, but I want to make a ramp so the rover can get inside the truck, when lowered the truck door would be the ramp, when close it would seal the back. Is there anyway I can achieve this? Below I depict what I mean.