Use limit straps. They can me mounted just about anywhere. From the frame to link bar, or you can get some slightly shorter than the shocks and mount them there. They are fairly cheap, and they will stand up to a lot of abuse, and they come in pretty much any length.
Heres a link to where I get mine. They make them in house and ship pretty fast, and will get you custom sizes if you need.
http://www.polyperformance.com/shop/Poly-Performance-Limit-Strap-p-47.html