FOMESALINE F-780S needs ‘21L tank’ to meet with 80% filling ratio and limitation of GW for 3 axle chassis regulation in VN.
As for 24L ISO tank, even the filling ratio is met, the product would be overweight for limitation of GW for 3 axle chassis regulation in VN.
Another option is to have dedicated 21L tank, which would be optimized for regular shipment and quotation obligatory as Interflow rate [Ocean freight, Origin THC, Origin port LOLO, Tank rental, 14 days freetime, tank demurrage]
Remark
GW is N.W.+T.E. [ISO tank is averagely 3.5-4 tons]