A transmission arrangement for an engine driven vehicle having two continuously variable transmissions serving to drive left and right hand vehicle wheels at separately variable drive ratios. Specific applications including efficient power transmission and high frequency magnetic field generation are discussed, and the advantages over prior art are mentioned. The attachment is configured to be positionable over and substantially laterally surround at least one pair of round bales arranged substantially side by side and having corresponding diameters in close proximity of each other. At least one of the plurality of adjacent context identifiers may be selected utilizing at least one of the default context identifiers.