The Range Rover resides at the pinnacle of the Land Rover lineup. It's their largest and most luxurious SUV. And if you care enough about those who'll be riding in the backseat you'll opt for one with an L on the side. It stands for long-wheelbase and it provides an extra 7" of rear legroom. Introduced last year, the long-wheelbase version is now offered for 2015 on the more common …