The 2020 Frontier might be a workhorse by nature, but Nissan also offers its basic pickup in PRO-4X form. This trim level is geared up and ready for an off-road adventure thanks to the addition of some choice upgrades which make this trim level seriously capable off the beaten path. So what makes the PRO-4X so unique? It has to be the 16-inch off-road design aluminum-alloy wheels, Bilstein high-pressure performance shock absorbers, as well as electronic rear differential locker. The PRO-4X also gets underbody skid plates for the gas tank and other essential bits. Interior features include power-adjustable front seats and a ten-speaker Rockford Fosgate sound system.