While it sounds simpler, a K3 is actually not that well suited for this job. The front door on the left side is permanently closed as these doors were converted into escape chutes, and the rear door was bolted shut as well during the Tanker conversion. I know that the team on ZA150 have opened up one of the rear doors but I cannot remember if that means that it can be opened normally. The hinges may have been removed during the conversion, going by my photos.