GTV 3.0 probs, any info appreciated

[johnnystealth]

A couple of niggles with my GTV V6; anyone know what loud squeaking from the rear suspension means? This is happening virtually every time the car moves, and its loud. Another thing is a major amount of wheel hitting the arches (standard teledial 17 inchers) both front & back but especially the back, and with someone crammed into the back, i get it even under gentle cornering?
I'm new to the car any advice appreciated; would be nice to know how scared of the bill I need to be before I take it to a garage...

Cheers,

John