If they need 6 wheel truck to transport 2 wire slings (one sling is 1 meter long ,another is 2 meters long, both coiled) that would be real revolutionary mean of transportation. 11T and 15T means SWL, that is a weight of the cargo can be lifted, not a weight of the wire sling. Nobody is making slings that heavy. They can fit that into ordinary car trunk. Each sling is not heavier than 10 kg