Shocks and rear wheel allignment

[Fifty150hs]

I took my 2006 3.0i with standard suspension (no airbags) in for a wheel alignment. The mechanic could not get the rear camber into spec. He said he thinks it is because the rear struts are shot. (so are the fronts, I don't think they've ever been changed in 180,000 miles.) He said he thought the worn struts were allowing the rear end to sag thus forcing excess upper, inward camber. Does this sound right to you guys? I didn't think shocks had anything to do with ride height. I thought that was controlled by springs. If it is the shocks I'll replace and hopefully solve my problem. I'll replace them anyway due to their age, but if the problem is caused by something else I'd like to address it at the same time. Any input is much appreciated. Thanks