Trew has it spot on i
I'd then say HD springs, at least on the back but probably all-round, new shocks, but it might also be worth replacing all the rear end bushes ... ARB's, A-Frame and have a good look at the wheel bearings at the same time.
It could be just the dampers (aka shocks) that need replacing. Check the rear body mounts as well and the bushes on the link assembly on the rear axles...... the problem i have is the disco when driving feels at the back like its moving a bit from side to side and some one said its my springs so i thought i would replace them.....
Terra Firma are the best that you can get. Avoid Britpart.
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