The car makers do noy need to put the cars through test.
It is legislation that governs how much you can tow up to kerbweight of car basically.
The only rules are not to exceed grose train weight and recommen to keep below 80% of car weight for any trailer etc.
At the end of the day if you can buy a tow bar for it(you can) the tow bar has been tested and manufacturers are not going to drop themselves in it by making something you cannot use, and could be potentialy very dangerous.
tabetha
my cossie has not been officially approved for towing but will be towing.
Just find out weight of car then you know where you stand, go to a weighbridge, thye will tell you and won't most likely charge you anything either, scrap metal dealers always have these to weight the trucks etc before and after unloading so they know how much has been dropped