I've never delivered anything else here so I'm unsure how regular pickups/drops are handled in this spot, or whether this is caused by the trailer I'm using - it's a flatbed three axle spread steerable. I thought the bed was fouling the wall at first, but whatever I tried it just won't go any further than this.
edit: as above never done this one before, the spot is facing the other way that's why I tried the entrance I got stuck in - perhaps you're meant to reverse in? I got in and out that way eventually.