Yeap, that's what they are. They have been used in off-road applications for some time (construction, mining, etc.) but a new breed designed for highway use is starting to gain attention from fleets. Michelin and others report up to 5% fuel economy gains when 8 tires (two axles w/duals) become 4 in their test fleets. Rolling resistance is much reduced and weight is saved as well. The tire is stiffer though (to carry the weight) so I wonder if it would be suitable for an RV, which afterall is supposed to be a comfortable vehicle.