The delivery folks did a basic walk through, but didn't really go over anything. I've owned multiple RVs in the past, but not run across a wrench like this one before. Not used on levelers, wheels, etc., that I can see.
Do you have a power tounge jack? If so look for a cover that might cover a place that this can be inserted that will allow you to manually run the jack. Just a guess on my part. I have one that is similar that does it on mine.