Loaded Disco.
With the "frosty gas" you are basically letting gas flow from 1 cylinder to another, this is called decanting and relies on a pressure differential- ie depressurising the recieving cyl by opening a bleeder. The sending cyl needs a special valve that draws from the bottom of the cyl ie liquid withdrawal.
With autogas you are PUMPING the liquid gas in and they generally spray fill which tends to lower the vapour pressure build up. In any case the vapour will turn to liquid under enough pressure.
The AFL (Automatic fill limiter) is basically a float valve that stops filling by closing the valve- like a dunny cistern- at around 80%
I would say that each of the 3 cyls would have an AFL and when 1 fills then the other 2 get more gas until full.
Clear as mud

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