Hills should always be tackled straight up or down and sideway slopes avoided like the plague. A vehicle has to be at an extreme angle for it to roll head to tail, whereas a sideways roll can occur at much more modest angles. The way your luggage is packed has a pronounced affect on the angle a vehicle will roll sideways. You should avoid placing containers of extra fuel and water on the roof of your vehicle, as this will significantly decrease the angle at which a rollover is possible. This occurs because the extra weight on the top of a vehicle increases the 'center of gravity'. Heavy gear should always be packed low inside the vehicle and as centered as possible while only lightweight gear should be placed on roof racks.
The type of terrain will also affect the sideways rollover angle. In sand, mud or other soft terrain the weight transfer to the downhill wheels will cause them to sink, increasing the actual slope angle. So what may appear an acceptable angle on firm terrain may result in a rollover on soft terrain.
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