Having been involved in the Tow Car Awards event since 2007, perhaps I can throw a bit of an insight into how we get the results. To start with, calling the event the Tow Car Awards is perhaps a bit confusing. Each car tested (and please remember that only the cars entered by the manufacturers can be judged, so when there are apparent omissions, it's down to them) has four categories to be scored in:-
1. Towing
2. Solo
3. Practicality
4. Buying and Owning
The "Solo" results are based pretty much upon how What Car? testers rate each car. On that basis, it is a very subjective issue, as I know that I've driven cars that they rate highly, but wouldn't entertain one myself, and probably vice versa.
The "Practicality" covers a whole multitude of things, like the amount of boot space, ease of getting to the towing electrics, do ALL the electrics work, clarity of the handbooks, how much the rear suspension drops with a caravan hitched etc.
"Buying and Owning" covers the costs of running each vehicle, and includes comparative economy (and True MPG where the tests have been done), CO2 emissions, purchase price and depreciation, Company Car Tax (something that once again isn't relevant to me), etc., etc.
"Towing" is based upon several judges driving a course, which includes numerous different tests, including a 1:6 hill start, and a 60 (and 70 if stable at 60) dual-carriageway run, together with many other things. Each of those is judges pretty much by a "seat of the pants" method, but surprisingly, the results from most judges tend to have the same cars at the top, and the same at the bottom. One of the judges is involved in more scientific methods. The car is GPS tracked, and whilst the ATC units do not operate the caravan brakes, live data is obtained by Al-Ko so that yaw, roll and pitch rates can be obtained at any point during the test. Stopping distances are measured by taking GPS data giving 30-0 times and distances, and whether the caravan pulls up smoothly or it thumps the car etc. That test is carried out at exactly the same spot on the test tracks so that it is as consistent as it is possible to be. Two 30-60 measurements are taken too. One in each direction of a perfectly flat section of track. Finally, (and the bit that sorts the good from the bad) lane change tests are done. These involve passing through a gate, swerving to the right to pass through another gate, and then back to the left for a third. The runs are done at 30, 32 and 35. The higher speed tests (which seem like nothing really, but believe me, they're plenty fast enough!!) are only done if the car is successful at the lower speed. Some of the results of this are quite startling; cars that were expected to be good were poor to say the least.
The final results are weighted towards the towing scores, but as I said at the beginning, lots of things are taken into consideration.
When the results are announced, people seem to get in a real state about what's done what. At no time has anyone from PC said "thou must dispose of thy worthy tow car and go thou must spendeth thy hard earned on one of these" as it is realised that owners have different requirements of their cars. As pure tow cars, a bug, heavy 4X4 that is well controlled would probably make the best as they are capable of towing anything. But, not everyone has a large caravan (nor would want one!), and providing a smaller car is very capable of towing a smaller caravan well, considering that 90% of the time it is likely to be driven solo, it makes sense that it could be a winner. Indeed, there have been some large, heavy 4X4's (and pick-ups) that verge on being dangerous, whereas some of the smaller cars have been a real revelation.
Whilst we know that there are a number who are skeptical about these events (and had I not been involved, I could have been included in that when you see some of the results), a great deal of effort is put into the Tow Car Awards to get as much information as it's possible to do so. What is also interesting is the number of times over the years I've been at the NEC shows talking to various manufacturers, when an owner approaches and states that there is something wrong with their caravan. It usually goes along the lines of "we've had the caravan for three years, and it was fine behind our ******. We've recently changed the car, and now the caravan is all over the place. Do you think it's likely to be the stabiliser?" Sometimes, looking back at previous events might have shown that the "new" car is pretty poor when it comes to stability.
The results of this year's event will be announced in mid-June!