PML is just the acronym for "Poor Mans Lift" all you're doing is cranking your torsion bars to lift the front of the truck about 1 1/5" then put shackles or an aal in the rear to also lift about 1" or so.
Thousands of people have done that and taken their Xs off road with no problems at all. So it's safe to say that a PML will hold up off road.
Honestly, in my opinion, you're better off piecing your lift together from 4x4parts. The AC UCAs in the front, Bilstein 5100s all around, shackle, aal, or a new leaf pack in the rear, and torsion bars (not 100% necessary though). But you'll be able to get about 3" of lift with quality parts.