If I understand, you need to replace the original crank-up / crank-down tongue jack. Manual tongue jacks are pretty much a standard item, and you will find them at any RV supply store - or better, at one of the on-line stores such as etrailer.com, pplmotorhomes.com, dyersonline.com or (of course) amazon.com. As reflected in the posts above, you need to be sure that the one you buy is the same style (side crank vs top crank), has the same size tube, and has the three mounting bolts in the same location.
As for leaving the trailer on a side-mounted temporary jack of any kind, I would lower the front stabilizers to the ground, then crank them down an extra turn or two to take some of the weight off the jack - but more important, to ensure that the whole tongue doesn't move sideways and drop to the ground if (for example) somebody pushes the trailer sideways. Lots of lawsuits happen when a trailer unexpectedly moves and hurts someone.
Hope this helps.
Bill
|