BioMax
+1y
If you do choose to run the ladder bar style, try to keep it as lonk as possible and so that it is parallel(ish) to the ground at half travel. Now that obviously takes up space in the bed, but that is the sacrifice. A 4-link type system would only eliminate the twisting forces placed on the knuckle, but will still push and pull as much as an equal length ladder bar.
It's hard to give a difinitive answer to a question like this. The end use for the vehicle will determine the most effective way to set things up.