general maintenance replacing of gear

I am in the process of replacing my shockers (recent forum). These have done approx 50,000km of hard driving (googs, gawler ranges, flinders ranges, birdsville, innaminka etc etc). I am doing the Simpson in July so I thought it time to replace them for comfort and security of knowing they are new.

My question though is do I need to replace the steering stabiliser at the same time? Does this have a hard life like the shockers when off road? A general question is how often are the coils replaced?

Thanks,