Rear Differential Locker

Howdy, wondering if any one has outfitted their class C with a rear differential locker? I'd love to send out my class C for a Quigley 4X4 conversion, but I'm a day late and a dollar short.... But I have diff lock on my pick up truck and it is great for getting out of the mud. Thinking it might be a possibility on the camper. It would really help when in mud on a slight hill when only one rear wheel is spinning. It is a Ford E350 2002.