Every rover is different. Some can go to 3" or higher and have no issues. Be carefull replacing the radius arms and other parts with aftermarket fabricated ones. Rover uses solid formed pieces whereas the aftermarket part a cut and welded, therefore, weaker. To correct the steering wandering issues associated with a lift, make sure you change your steering damper and add a trutrac front locker to make it drive straight. Definitely will need extended brake lines. The general train of thought is this...decide what size tires you want to run and why, plus what tye of terrain you want to tackle, then lift accordingly. Don't go higher than necessary b/c you will then be too top heavy.
One idea is to do this...go with a 3" suspension lift, then add a 2" body lift - you will have 5" total but keep your center of gravity the same as a 3" lift, sans any roof rack weight and so forth.
As far as suspension lifts go..EE, rovertym, $afarigard, they all make good lifts that you can istall yourself even if you are minimally mechanically inclined.
As far as body lifts go, I have heard the best about rovertym. But then, I am sure there are other good ones out there.
My two cents/sense. I would like to hear from others on these issues as I am always willing to learn and expand my knowledge base.
Whatever you do, you have to take pics...unspoken rule here..
