So... basically, just to round out the answer to your questions:

the way people lift their trucks with torsion bars is by tightening them - ie: making them stiffer - this then lifts up the truck a bit. The result is a harder ride, but this lift is really really really easy to do.

Someone up there ^ explained already what a spindle lift does.

AALs stand for Add A Leafs and that is exactly what it is. You add 1 or 2 or however many more leaf springs to your existing pack in the rear, doing basically the same thing as a torsion bar crank, but to the ***-end.

You can also install longer shackles which will drop your leaf spring pack down and with it, lift your truck up. I think there is some baseline formula like 2" longer shackles equates to 1" of lift.

There's also the "lift block" option which is a piece of... something... rubber, steel, Al, something that you put between your leaf pack and your spring plate on the axle to lift your pack & truck up. These look like dookie too, but they're cheap.

The last thing is the body lift, which just picks your body off your frame. I hate body lifts.

Hope that helps you understand what you're doing a little better.