Surfer,
you clearly have not seen the MIRA test facility, or read the CC information on what the tests comprise. Where on real roads can you tow at speeds far higher than 60mph, where can you do a controlled emergency stop repeatedly, where can you safely do an emergency lane change, hill start under controlled conditions. The tests give standardised comparators which real road tests are unlikely to do. The only variables tend to be weather, and the testers own judgement and weather you can do little about, and the variabilty of testers would be the same evn on real road tests. They give an indication and also are dependent on the manufacturers supplying new or modified cars, so as we all know there are other very good and very poor towcars out there. The TOTY is only a sample but just because it's not a 4x4 behemoth with a 8m twin axle doesn't invalidate the outcome. ( ex big outfit vanner myself)
At the end of the day people make their own decisions. One outcome that the results seem to show is that VAG make seemingly good tow cars in a range of weights and prices.