Clunk from NS rear suspension

[greg124]

When the car is loaded up I get a clunk when going over a bump which sounds as though it is coming from the NS rear suspension.
I changed the beam bushes about 2 years ago, with new shocks at the same.
On inspection it I can see about 5 or 6 mm of rubber on the inboard side of both trailing arm mountings, but none on the outboard side. The visible rubber does not look perished.
Does it sound as though I need to change the trailing arm bushes, or could it be the top mounts that need changing?

[Grrrmachine]

It won't be the trailing arm bushes. They have that excess rubber to aid fitting.

[greg124]

Thanks Grrrr. I wondered whether NOT having any rubber visible at the other end might have something to do with the symptoms.
Does this sound more like the top mounts then?

[capnmchl]

Check the top mount out.

[greg124]

What's the procedure for checking them?