First, read Pirate.
Second, leaves, as a general rule, are more stable laterally. This is due to several things, largely having negative pressure throughout the travel so it never is just hanging out and because there is USUALLY less travel.
Links with coilovers or uncaptured coils can unload suddenly and unexpected to the limit straps if there is no swaybar.
If you have a truck, why keep the bed? If you need a 4-link, you suggest to me that the rig is off road oriented. A clean flatbed to allow optimal link placement and tall coilovers/coils/shocks would be a lot better.
Here is the rear of my 95 Runner.
