I did a 6" Suspension and 3" body lift on a 1998 Chevy Tahoe and would imagine that the Suburban would be very similar. The body lift was actually very easy to do. About 1-2 hrs in the drive with a jack. Only hard part was fixing the rear bumper because the kit did not have brackets to raise it. Had to make new brackets out of 1/4 plate I had laying around. Everything else was fine. No gas filler issues, all the wires were long enough, etc.
So 2 points - The body lift will work fine and is not hard to do at all. And you can do the suspension on these trucks too with out just cranking up the torsion bars. If you are going to crank the torsion bars, do it by hand, not with an impact so its easier to count how much you have moved each.
Just make sure that if you do the body lift, go all the way - make filler pieces for the rear wheel well area (or buy the rubber ones even) so you cant see the body raised up off the frame. If you do that and the bumpers most people will never know the difference.
So 2 points - The body lift will work fine and is not hard to do at all. And you can do the suspension on these trucks too with out just cranking up the torsion bars. If you are going to crank the torsion bars, do it by hand, not with an impact so its easier to count how much you have moved each.
Just make sure that if you do the body lift, go all the way - make filler pieces for the rear wheel well area (or buy the rubber ones even) so you cant see the body raised up off the frame. If you do that and the bumpers most people will never know the difference.