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Hi Andrew,
Well, I don't believe the Volvo owners manual mentions anything about stronger rear springs when towing. Remember, trailers don't put a lot of weight on the hitch (rear suspension) if the trailer is properly weighted. It's when you put weight in the rear of the car there is more of a direct effect on the rear suspension. I'd suggest a set of overload springs like the ones that IPD offers (http://www.ipdusa.com/ProductsCat.aspx?CategoryID=209&NodeID=1163&RootID=629). If I was doing any serious towing with one of my 745s, I'd have a set of these fitted. If I towed a lot, I'd probably convert to Nivomats (http://www.ipdusa.com/ProductsCat.aspx?CategoryID=1390&NodeID=4340&RootID=629) which were standard on the 760, 940SE, and some 960/S/V90s. I suggest that unless you carry heavy loads virtually all the time then I'd suggest you try the overload springs and a set of these: http://www.ipdusa.com/ProductsCat.aspx?CategoryID=15&NodeID=1178&RootID=629 or these http://www.ipdusa.com/ProductsCat.aspx?CategoryID=1389&NodeID=4337&RootID=629 in the rear. I hope this helps!
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Chris. Halifax N.S. '91 745Ti, 290K km and '91 745 NA, 376K km.
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