i have a 650 ibc and no bulkheadsecured with two 5 tonne ratchet strapsthese are attatched to a galvanized steel "tray" bolted thru floor (spreaders behind) and chassisi have got a drivers gaurd tho (cue various comments about safety :)
Squashed and fly spring to mind lol.
anyone know how strong a factory fitted steel bulkhead is what about drivers guard surely if the tank is fitted properly it dont matter