Haven't used em or seen em installed. But I went with solid (PS RockerKnockers) that catch the frame AND pinch seam for strength - I can jack the entire side of the rig up with my sliders.
I think these would be okay for a mild off roader - but the first time you get em really hung up on the rocks - dont expect them to be fully functional anymore and as they only mount to the pinch seam and floor - could seriously damage the pan if really hammered on...
J Wm Bishop EA, ASADE
The wagon should, of course, be as light as possible, but strength should not be sacrificed to lightness, for on any but the regularly traveled roads, the wagon will get many a hard knock