Given your issue I'd have to suggest foregoing testing and just do them.
You have removed the front prop so any weird interactions via VCU is negated, only bushings remain if your chassis isn't rotten.
In an effort to save some bucks then a big lever or fcuk of screw driver inserted between arm and mount is the usual course of action when checking bushes, but, and this a bigger but than the usual smaller but.....this usually only checks side to side play, I think you may have fore and aft play, mounting design can make it difficult to check F&A play.
A small (1/8") sideways movement in the radius arm would be acceptable, I'd want to see equivocal or less with F&A.