The tube thickness is 0.120 hrew. And there are 5 legs conecting it to the frame. It is plenty strong! The sliders have the rust oleum spray bed liner so the traction is pretty good.
I made therse rock sliders for my buddy's Tacoma. We used 1.5" square tubing for that bulky, industrial look. I think they turned out pretty sweet.
And here is a pic of me welding them on...
Let me know what you guys think.