In Alaska on the 200s, which by the way had the gravel kits. MarkAir. we would get the job done with multiple engine shutdowns and start ups depending on which side was being used at the time.
it was long ago, back in the early 90s so, I think it was: Come in, shut down left engine. Off load pax. close the door. start left eng, shut down right. Do the fuel and bags, off and on. When finished, start right, shut down left, open door, load pax, paperwork. close door and start left engine and leave.
did it several times out in the remote villages. It was always COLD!