iv got a 500l flat tank in the van. its not really flat though at 600 high x 1000 x 900. the baffle is only one way which is sideways.stupid stupid junk design for a baffle. the front to back slosh is doing my head in. its like a car full of people lunging forward backwards all the time. i saw on youtube guys put playballs in the tank with holes in them. iv done 100 balls but think i may need hundreds more to have any effect. anyone else solved this issue.