Out of the Sprinter, Dodge, and Transit, I knew going into it that the Ford had the worst traction capabilities. I took mine (2019 148" mr) to a gear shop the first week of ownership to have an Eaton electric locker installed in the rear~$1500. The shop that did the work did not offer wiring of the unit, only the install and setup of the differential. The wiring was pretty straight forward, but still a chore. When I finished, I took it to a local hill that we hang glide off of to see how it would do. Amazing! Turn off traction control, flip the switch on the locker, and I was going up hills that some of the 4wd's had a hard time with! Highly recommend it! Way better than limited-slip/pozi, to the point of driving the van even when one rear wheel was in the air due to off-camber! The safest way to use it, of course, is to use it to get out of a situation that you got into with the standard, crappy TCS, not as an alternative to FWD.