Our solution to the troop exfils was that they lined up in rows of three and quick-marched up the ramp until they started bouncing off FS245. Each row was counted off by the ALM and guesstimated at 1,000lbs. When we were full (or at MTOW) the ramp was closed and strops attached to floorpoints were secured across each row to provide something to hold onto.
On the Casevac side I remember doing a full mission profile to examine how effective we would be. The low-level turbulence and jinking required to avoid oil-fires. helos, particularly tall camels etc. would have ensured that any pax who were not injured on boarding, would have been by the time we landed. As I recall, we also had the callsign 'Stiff' which I was told was thought up by one of the STS wags.