| http://www.w3.org/ns/prov#value | - An all wheel steering system for a tractor-trailer rig, the tractor having at least one pair of front wheels with a front wheel angle, the tractor also including a steering wheel, the trailer having a first and second pairs of rear wheels that are steerable, the first pair of rear wheels having a first rear wheel angle, the second pair of rear wheels having a second rear wheel angle, the front whe
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