I added my first set while I was still working. I had access to aluminum stock and a welder to weld heavy aluminum. Note that I had to use half width nuts due to the stud length. Used lock washers, red loc-tite, and staked the ends of the studs with a punch. Just to be sure. lol
For the second set I scrounged some 3/8 inch thick slotted angle iron and welded a 1/4 thick steel plate to them with my small home welder. Used nyloc nuts and red loc-tite on all hardware. Hope these ideas help some one out there add stability without the high cost of hydraulic levelers.
later, Jay