I have a 2003 e350, extended, with an Ox Locker. All I have is a picture right now but maybe I can get a video soon. We took it to the Cinder Hills OHV park in Flagstaff, AZ earlier this summer and I was really impressed with its ability to navigate the loose unconsolidated cinders. However I did get stuck on a hill that was about a 30% grade when I went off the more trodden path. I got it on my second attempt, staying in the track. The main trouble is I didn't regear it when I installed the locker so with 3.55 gears I run out of torque on steep stuff or with big ledges. I will have to see if the locker helps me get unstuck this winter in the snow.
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