If you do not load the suspension, the bushings will wear out prematurely. However, unless you can adjust rear toe to spec, you will need an alignment anyway, and could ask the tech to do it on the rack.
There are five links, though, and I am not familiar with the names you used. Are you replacing the pivots in the spring support arm?
'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7