You'll like this setup. The video I put up of my little brother on the shakedown pass was done using this setup as his class only allowed stock type suspensions. Go the extra bit and purchase shocks that can be adjusted for compression and rebound. Do the same in the front and that wagon will bite like an alligator. Also, spend the extra time getting your pinion angle exactly where you want it. A great setup.
Cheap 9 way adjustables in Aus are Rancho?s or Calverts, some guys go to a super expensive shocks but that is mainly boosted cars not trying to load up the rears.