so after playing on the interwebs and looking at a few too many pixels my SWAG is the following:
There are 2 styles of landing legs and stabilizing jacks that are dependent if the MWO 9-2330-324-23-1 has been applied.
If the original landing leg has not been modified; the original stabilizing jack does have a crank handle and adjusts like your typical jack.
If the MWO kit has been installed the front jack is replaced and a beefed up plate and support is installed. It then calls for a different rear stabilizer that appears it can only be adjusted by lowering the bottom leg and choosing the right hole the pin will go through which means all the adjusting is done with the front jack.
My newest acquisition does have the MWO kit installed.
GP pic is of a un modified trailer with the original carppy front jack and the original stabilizer.
My theory might explain why either of these stabilizers are hard to find as the originals got tossed when upgraded.