Effects of replacing Nivomat shocks for standard items XC70

[Low Pro]

I'm replacing the Nivomat dampers and springs on my dads old XC70 (02 plate), however I'm slightly concerned that this will compromise the ride and handling of the car. The original dampers are in poor condition and have been on the car it's whole life (107k). But the car tows a caravan and is used as a work horse, should I fork out and get new Nivomats?
Thanks in advance
Mark