Check these out!

[GOODOLEBOY84]

ive seen those spring rockers on a bronco and they really helped flex but the guy said they drive funny on the rode, to unpredictable, and they have bushings in them that where out really fast, works great in theroy

 

[MEAKIN]

having an articulating frame would help too, doesnt mean its a good idea. like whalstrom said, more stuff to brake