Nigel Donnelly said:
Cars are tested with vans ballasted to 85% and with the maximum noseload applied. Where the tests are really good is spotting the poorer towcars. We test at 85% because that remains the recommendation of safe matching by both clubs and the NCC. It's a level playing field and it does allow meaningful comparison between towcars.
A car that is bad at 85% is not going to get any better at 90% or a 100% match. Driving 50 cars back to back really sorts out the good from the bad towcars. And in its weight class the Passat was awesome. The Hyundai ix35 2WD in the same class (and heavier) was far poorer in every measure so regardless of the weight / match you tow at, it is a rigorous and worthwhile comparison.
Your testing method makes no sense to me. Not trying to be rude.
As the tests usually use Bailey caravans, why can't the tests be done with for example a unicorn Valencia at its MTPLM of 1565kg.
Towed only by cars capable, whether the ratio is 80%, or 95%.
That creates a level playing field, and would give useful data, and most certainly show which of the cars tested, was the best, and give a order of competence.
As it is, what weight was the passat towing, 85% of what, as variations have different kerb weights.
The same test could then be done for a popular Pegasus model, and like wise the orion.