Just replaced my 400ltr flat tank with a 500ltr flat. I say flat, the 500 flat is more cube shaped than flat. Anyhow, I've fitted it with the central baffle running lengthways to the van whereas the 400 one the two baffles ran transverse to the length of the van. It's like being in a boat!! Ok when the tank if full but once the level drops a bit the water must be waving like billy'o front to back. I can feel a forward & back sensation when I'm cruising along!! It's no biggie to turn it round but it's ideal as it is. How does everyone elses baffles run with what tank??