I have always had very serious doubts about the use of Rose/Heim/spherical rod-end joints on road going cars ever since seeing the breakage of one during an Ebworth Trial. Had it sheared on the road then the consequences of the total suspension collapse are obvious.
Last night I found this interesting website :- http://www.infrastructure.gov.au/roads/vehicle_regulation/bulletin/pdf/Street_COP_sec_5.pdf
Full of very practical advice and safety measures for special builders - and unlike our SVA test it seems to avoid nonsense such as 'not using a steering wheel with holes in the spokes - in case you get your finger stuck'.
In Australia they have a total ban on Rose joints being fitted to road going specials :-
Heim joints are not to be used as a suspension or steering component - other than as a steering intermediate shaft guide bush.