The locker makes a huge difference here in the midwest when we get 8-10 inches of snow like these last 2 days. I blew by a bunch of other trucks that I know didn't have lockers, or AWD.
The locker makes a HUGE difference off-road, on-road with snow, all kinds of different places. If you don't want a locker, don't get one.
If you want to be safe and have fun and no worries, get a locker and cruise...

Chezman