ok,bare with a newbie to jeep lifts here. I have decided to go with a 2" budget boost for my 92 xj with 30x9.5 tires. I am pretty much set on going with spacers for the front,but am confused about my options for the rear. What are the advantages/disadvantages of AAL,blocks and shackels for the rear? which is easier to install? how bout ride quality,although it isn't a major factor.