back to unknown , it doesn't look like soviet stairs

https://www.imcdb.org/vehicle_1349963-KhAZ-SPT-104.html

ditto same stairs again , probably here not that worth listing as very background
https://www.imcdb.org/vehicle_1360637-KhAZ-SPT-104.html
https://www.imcdb.org/vehicle_1508374-KhAZ-SPT-104.html
https://www.imcdb.org/vehicle_1505558-KhAZ-SPT-104.html