AAL stands for Add A Leaf. Essentially it's a long leaf that you insert into the pack to help push the truck up. They aren't the best way to go, but they are fairly inexpensive. Since Comanches frequently sit higher in the back, you could even skip the AAL and get a longer rear shackle. You get 1" of lift for every 2" that the shackle is longer than the stock one, so you can only get so much out of them. Look into the drop shackles for Chevy trucks. They are longer than the MJ stuff.
Neither of these routes are the best way to lift, but they are a cheap way to get a small boost.