I will leave that for people that know better than I. I have a flat bed crew cab 4x4, Im not too sure anything is more harsh. I need better seats, but the 33" tires helped A LOT. I have always been a solid one ton truck ride fan though. I grew up in f450's delivering 10k lb injection molds. Things would beat you to death and I loved them. I figured I would grow out of it but, alas, not yet.
punk
you might call your local tire/ suspension shop and ask them. Keep in mind that they are trying to sell you somthing, but the basic idea's that they outline to try to back the sale will work regardless. Then look online for something cheaper (or just get it from them if it is a locally owned shop, might be a little more $ but you have a place to get questions answered)
punk