So what exactly are you guys talking about when you say a 4 link will create a form of rear steer??
4 link is a suspension set up, where the axle is attached to the body via 4 bars, there is parallel 4 link, where the axle has 2 bars on each side that run parallel to each other, with that setup you need a panhard bar to control side to side movement, and there is triangulated 4 link, in this setup there are 2 bars that run straight to the outside of the axle (one per side) then there are 2 bars that go from the frame to the center of the axle, this setup will keep the axle centered with out the help of a panhard bar.
Parallel
Triangulated
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