I don't have a clue as to how good or reliable the ARB AirLocker is in bigger pickups, but mine in my early-'95 Toyota 4x4 pickup is still trouble free after over 15 years. I've had four rear LSD/lockers since '72... two OEM clutch-type in Scouts years ago, a Downey in my '80 Toyota 4x4, and the ARB. The too-tight Downey was a nightmare-in-waiting on anything but dry pavement... low-speed sliding sideways on uphill packed re-frozen snow or flat curvy ice. I'll take a driver-controlled locker, thank you berry much.
Jim, "Still plays with trucks."