want easy way to air rear 78 blazer

[blazer2007]

I was wanting to bag rear of my blazer,fr. is done now.Is easy with truck as can take box off,I getting tired of laying on my back.I was thinking of 2 in. blocks and removing some springs and using one of those camper type air helpers.All I want this year is to go down 2-3 inches so It matches the front.I have a notch and is flipped already.I've also seen what I think they call a cantilever setup where there is a 2-2 sq. tubing going from fr. hanger to axle with the u-bolts,but I don't see any panhard bar etc.in these photos.What stops rearend from pulling out or going side to side.This way looks fairly easy to do wilh no or little welding.Thanks