We have come up with different approach .
More structual but still utilising the flat bar.
Got a 1.6m 'spine ' of 60mm x 40mm box , with 4 'Ribs' 40mm x 40mm welded at 90' onto the spine . Load will be on ribs mainly , but shared by the spine .
WHole assembly will resemble an over engineered TV ariel .
4 lengths of chain bolted to the 4 ribs and over the FLT forks,
The 6mm x 75mm flat bar is inserted into the slots and sits above the TV ariel . FLT lifts the ariel and the 'ribs' pick up the underside of the flat bar , and 6 full beer barrels are lifted evenly , without twisting, by the FLT and manoevered over a Euro pallet .
Once in position the forks are lowered till the chains go slack. The flat bar is withdrawn from the slots , and put ontop of the forks ,
FLT picks up 'ariel' and trundles off and lowers 'ariel' onto next 6 casks . Handles are aligned and flat bar inserted , then its up, up and away with another 300kgs. Repeat 3 times and thats 18 casks in a 2 x 3 x 3 high pattern @ 900kgs , 1.5m tall with zero lifting.
Repeat whole operation 4 times and thats 1 bulk tank of beer filled and stacked in about an hour, without me and oppo lifting 72 x 50kgs onto pallets 3 high. So I can hopefully ride my bike further and faster without being crippled.