6x6 suspension chassis

I'm searching for a 6x6 suspension chassis designed for use on outdoor terrain. The chassis should have the capability of withstanding shocks and vibration, while still providing reliable performance. I am looking for either reinforced steel, carbon fibre or aluminium alloy chassis construction that has been designed with the terrain I expect to use it on in mind - whether that is rough tracks, gravel paths, or roads. Ideally, I am hoping to find a chassis that is lightweight and durable, but would still provide me with the necessary protection and performance for whatever terrain situation I find myself in.