At one time I thought they never made them but I bought a 70's factory brochure that showed a picture of a crew cab stepside 4x4 driving on the train tracks.
If it was like the 3 crew cab short box 4x4's that I've had they were available for things like hydro, forestry, railway & law enforcement (one of mine had been an R.C.M.P. truck) All three of mine had Dana 60's front & rear, 205 trans cases, one was a W350 the other two were W200's. The 200's both had dual tanks on the short box. All factory & all on the build sheet under the hood.

As far as I know they didn't made a crew cab 4x4 long bed but when it comes to Dodge NEVER SAY NEVER.