I have 1.5 off the rear and you would need to jack the truck up pretty far to have the springs fall out. You would have to be going pretty damn fast over a dip and get air in the rear for that to happen. I was actually in the dez this weekend on a dirt road. The trail from the main road was at an angle and went through 1.5'-2' deep rut to get where I was going.
Not trying to fight about it, just telling what I feel and been through