Hello Ray,
I think that it is a reasonably fair way for each car to be compared when its pulling 85% of its kerb weight. It would be meaningless if one was at say 70% and another at 90%.
When comparing the Skoda to the Outlander,it is cheaper to buy,more powerful,more mpg solo,lower road tax,lower insurance,bigger boot,and in my opinion better looking. I think the Outlander looks like its come from the film Jaws.However if the van was 1500kgs,then you would perhaps discount the Skoda. Its all about "horses for courses" so everyone will have different opinions on this.
Really these competitions are to give the general public some info when making choices,buying new or secondhand.If you were looking for a car that was 1 or 7 years old,then the same name keeps coming up. Sk.......
Cheers Richard