You sure about that? It's not a simple lever really, but more to the point it is unnecessary. The weight is too high, too far forward and frankly, in a very inconvenient place. And I question your figures. A Land Rover Defender wheel and tyre weighs 45 KG so i'd expect these to be 35Kg at least.
What you need to consider is the stability cross-section triangle. Imagine that you slice through the van at its f-r balance midpoint. Then establish how high the centre of gravity is. To assess how far off level it can go before toppling, draw a triangle with the middle of each wheel's track as the bottom corners and the COG as the top. Rotate the triangle until one side of the triangle is vertical thenmeasure the anglethebase makes with the horizontal.
The vehicle in question has quite a narrow track and is quite high. Unlike a bus, its heavy bits are not deliberately made as low as possible.
Have you seen how far a double-decker can tilt before it will topple? It's terrifyingly far. So the bus isn't anywhere near the limits of its stability, and not being 4WD isn't likely to go off-road.
A typical decker weighs 12T empty, plus 65KG per passenger. Typically 38 passengers on each floor, with extra standing downstairs only. So assume worstcase scenario; 5 passengers upstairs, none downstairs. Note 5 normal, not 2 or 3 obese (obese passengers don't go upstairs on buses). So 325KG is 3.5 metres up. That's 2.7% of the bus weight. That's not going to make much difference even though it is 2M above the COG. It will bring the COG up by about 2cm. The bus has a wide track so would have to be leaning a very long way to topple.
