I think this comment needs to be put into perspective:
CluelessNewbies said:
Hi Intoon. I just went through the same pain only in reverse. I bought my first van based on the confirmed maximum loads for my merc. Then realised i would have been a pulling a van of equal weight. I have just sone some driver training on towing to get me through my B+E test and there is a use difference between what you "can" pull and what you "should" pull.
My rig on the lessons and test was at 70% and it was very easy to drive. (I even forgot i was towing at time) As part of the lesson i was given a rig that wat 95% and it was almost undrivable by comparison. Needed to over rev to pull away, it wouldn't break and wouldn't climb a hill. It was real eye opener. The torque on the car also makes a huge difference.
The weight rations are only a suggestion and not a legal requirement but it really needs thinking about. In the end i swapped cars!
In simple terms, the only things you should be looking at are kerb weight of the car, the kerb weight of the van, (and making sure its a good ratio), the confirmed towing weight in the car being within the limits of what you will be towing.
Those cars are actually quiet light for the size of them! Nice though.
I agree wholeheartedly with;
" there is a use difference between what you "can" pull and what you "should" pull."
and
"The weight rations are only a suggestion and not a legal requirement but it really needs thinking about."
But the differences CN make between 70% and 95% is open to debate. Of course increas in a trailers load from 70 to 95% or even more will sap perfromance, but without knowing the vehicles actually used and there relative power, weight and torque, and how they were loaded its not a very informative account. No one in there right mind would expect a tow vehicle to perform as sprightly as when its solo, the real test is if it can keep up with the traffic around it when its towing so as not to cause an unreasonable hindrance. Basically if an outfit can match or better the performance of a bus or coach its generally not going to be a problem to use it on the roads.
How a trailer is loaded can make more of a difference than the weight ratio itself. I could properly load up a trailer with a weight ratio of 100% or above and it could tow with much better stability than a 70% trailer badly loaded.
Provide the tow vehicle has the necessary power and torque there is no reason why it can't make as good progress as the traffic around it