Used fixed length lines in SE Asia. 140' lines with up to four people usually. Maguire rigs as I recall. The folks locked arms or held onto a leg to get stabilized.
We were required to ride them before we were allowed to carry folks on them. Still one of the "E" coupon rides of my life.
A problem I experienced on one occasion is that, if you have a problem and can't get the people inside, they arrive at the emergency landing site first. Not a good thing normally.