So what i am saying is effectively right, it dont matter if it is baffled, strapped down or bolted to the chassis, the thin, one time use ibc tanks which you see on ebay for 30 quid are no use in a crash as they would just split open, they would not handle the impact as they are not designed for continuous use. Im not saying all ibc tanks are one time use tanks but the see through ones that are surrounded by a steel cage are and should only be used for storing water in a stationary position ie pure water from the ro ready for transfer to van tank.