Trailers with two input shafts for landing gear

Got a picture of what you are talking about? The only thing that I've ever seen is maybe a gear rod outside the casing, but it's not designed as a crank. I figured it's just cheaper to build that way as tolerances don't need to be as tight.

 

Sometimes the gears get jammed up. I had one that was stuck in low and wouldn't go into high range, so rather than sitting there spinning it around a million times, I moved the handle to the through shaft that links the two sides and it essentially made it high-range-only. The other input spins pretty quick, because it's still in the low range. That isn't how it is supposed to work...it's broke internally or jammed up or something. Yes, I wrote it up. I even talked to the mechanic about it when I dropped it. 6 months later, it still hasn't been fixed.