I often think of what would happen if my van rolled.
I think everything might fall apart. The bed platform and underneath storage are built around the wheel wells so no chance of them sliding in a panic stop and there are a few brackets holding it to the very well secured floor but upside down...I'm not sure. The house batteries are held down by brackets so would probably stay in place in a roll.
But we have done a bit of jarring off road travel and everything seems to be still in it's place.
Our 12V fridge just sits behind the driver's seat, unsecured, and we have various backs that slide under the bed from the front that would slide back out in a panic stop.
Our kitchen pull out is held in place by the back door. If I open it on a slope it will slide out by itself.
I need to come up with some clips or pins or nets to keep things in their place.