This company [link=http://www.molzermoweryracing.com/off_road.html]Molzer Mowery Racing[/link] manufactures GAS R/C vehicles.
The following are some examples of their off-road vehicles.

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The chassis of the 1:6 scale models Marder, Beetle Off-Road and On-Road are identical, they only differ in bodies, tires and chassis accomodation. The models are built on a 4mm u-bended chassis. All borings underneath the chassis are countersunk, therefore the screw heads can't bear out. Double wishbones at front and rear axle as well as 4 bulk oil-pressure shock absorbers guarantee perfect ground adherence. All rotating parts are supported by ball-bearings. Rear gear wheels, differential gears and all driving elements are case-hardened. The ABS-undertray (Beetle) and side guards (Marder) protect the models from dirt.