I just bought a Blue Jeans Blue F150 Xlt SuperCrew 3.5 ecoboost with Max Trailer Package and 3.55 rear axle. I will be towing a 1950 Vagabond 19ft trailer (vintage with birch wood interior). Can't wait to try the various built in trailer functions, like the brake controller, backup assistant visuals, and diagnostic electronics going back to the the trailer lights, etc. Could somebody tell me when I would want to use the Locking Rear Axle?

Living in the mountains between Sacramento and Reno.

Thanks, Walter