I've run a simular suspension spacer kit since the summer now, including the spring spacers (providing 2" of lift all round), strut extensions and rear shock extensions. This is the first suspension mod i've done, very easy and simple to fit too
In my short experience driving both on and offroad, I've not found any major problems, only a couple teeny things...
- I have found i should really have brought or customly cut, my camber angle adjustment, as i've noticed a slight wear on the outside of my front tyres.
- Also, i suppose it depends how heavy your load is whilst your offroading (i usually seat 4 people) but my springs have quickly sagged since installation, this is due (i believe) to not extending the bump stops. Which means, i've been sqaushing the standard springs an extra 2" when they bottom out all this time... I dont think many people do, but as i said, i guess it just depends of the weight of your truck whislt you play offroad in it...
Hope this helps
Andy