This game really does let you do anything! lol
A lot of people probably already discovered this but I'll share anyway.
My predicament: took on a Side Op where I had to extract a prisoner. The base camp where he was being held had four other high ranking soldiers/specialists who I also wanted to extract. The issue was that I was very low on Fulton devices and I wanted to save the rest for another Side Op without returning to Mother Base and the nearest helicopter LZ was +500 meters away. Obviously a 4-seater jeep would've required two trips and I just wasn't about that life so I confiscated a convoy, parked it near a cliff and proceeded to throw each of the four soldiers into the back of the convoy.
The awesome thing that I found was that the game registers them as being "seated" inside a vehicle and so they won't wake up from being knocked out! Drove them all the way to nearest LZ and bam! Creativity rewarded!
And an even funnier thing happened when I was driving to the LZ... as soon as I exited the Side Op mission area, the prisoner was automatically Fulton'd out of the passenger seat along with two of the soldiers in the rear of the convoy (hence why there are only two soldiers in the screenshot) LOL and none of what was used to Fulton them came from my inventory.