In Europe it was the FEM (French Origin) in the 1960s who dictated that all counterbalanced machines be rated at 500mm (20 ins). Larger machines would be rated at 600mm for 5 tonnes and above.
Reach trucks have always been rated at 600 / 610mm because, unlike a counterbalance that can lift everything, a reach truck is designed for pallet work so that is where half the 48 inch pallet rule you refer to works.
Forknlift is absolutely correct in that the adjustment between pounds and kilos makes the adjustment in difference in load centre
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