Lexus offers something of a bipolar SUV lineup. On one end, Lexus sells two tiny crossovers, the UX and the NX; on the other, Lexus offers two hulking, Land Cruiser-based off-roaders, the LX and the GX. One vehicle (at least for now) covers the vast gulf between them, the Lexus RX — and that’s the gulf where most SUV buyers reside.The RX is neither the sexiest nor the most capable Lexus vehicle. But its positioning makes it the Lexus