When you buy a tow rope it is usually marketed as something like "4000 kg tow rope" or similar. Does that rating mean that the rope is suitable to tow vehicles with a mass of up to 4 tonnes, or does it mean that it has a safe working load of 4000 kg, i.e. the rope can safely sustain a force up to 4000 kgf?
Obviously one wouldn't, or rather, shouldn't use an uncertified rope for any critical applications or at least without testing and verifying. I also don't trust any 'cheap' product I could buy at my local grocer, but I am curious about this number and what it is supposed to mean, disregarding marketing hype.