Astro turf is or can be a very high traction surface. It also does not tend to have directional grip and so when cornering the car will often bite in and roll over.
The cars are run with weight low in the car in order to put a larger proportion of the cars mass low down essentially moving the centre of mass lower in the car. This can be an issue with buggy's as a lot of weight can be found high up in the car, shocks and shock towers as the prime offenders.
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