I have a problem, a too long trailer jack, which is now bent along with the coupler. This happened initially when I was first bringing the trailer home and was parking in a truck parking area adjacent to a McD's. Unpaved with BIG holes. The jack was fully retracted with the wheel off. This bent not only the attachment on the jack but the A frame coupler. Attempts to straighten it out have failed, probably because of stretched steel. A swiveling side mount, because the frame is aluminum, may not be the best idea.
I am not afraid to cut some of the jack tube off but the ones I have looked at had the screw extending almost to the end of the tube. One other problem we experienced was that at CAG the camp site was "sloped" (the parks wording) to the point that I could not level the trailer even with the jack wheel off and the jack fully retracted. Therefore I need to find a jack that is short, or can be shortened and a new stronger coupler.