Question about tuff country lift

I am looking at getting a 3" lift from tuff country and was wondering a few things. I have a 2002 v6 dc taco with the trd package. I've seen that its an option for you to get new shocks and boots when getting a lift. I thought originally that they were to replace the front shocks since youre changing the height of the suspension. But today I saw that this guy http://www.parksoffroad.com/tacomamods/tc3inchspacerlift/tc3spacer.htm installed his new shocks in the rear. Is that what the new shocks are for? and if so why place them in the rear and not in the front?

Also I was looking at getting the aal because I have a little bit of axle wrap when I come to a stop at a light or stop sign. That will more than likely get rid of it correct?

One more question, I know that the sx6000 shocks are for midsize trucks and the sx8000 are for full-size. So I should go with the sx6000 or is it a preference thing. I do a little bit of offroading (diggin' where I come from) so would it be better in your opinion to go with the 8000 for a stiffer ride and more response from the shocks?

Thanks ahead of time,

Neal