Take a peek at this pic, which is from truckhaven photos set no.2
http://www.explorer4x4.com/thaven_driverrunboard.jpg
I made a set for my truck also before truckhaven,
http://www.explorer4x4.com/thaven_roadkill.jpg , though not as visible as the close up.
We made them from steel square tubing, 1.5 x 3, 1/8 thk wall.
1- cut to length, wheel well to wheel well.
2- drilled and tapped on the back (1/4-20)
3- bolted from behind through the sheet metal lip that always gets munched on rocks. I used about 10 bolts on each rail.
4- Could use washers, or I used a same length 1/2 x 1/8 thk bar on the other side of the lip, sandwiching the lip when drilled to match the tapped holes in the bars.
I went to Big Bear this weekend, and the black diamond trail gave them a workout. Lots of scratches on the bottom of the bars, but I didn't get any more dings on the rocker panels to fix (again!)
I spent about $65 at the metal supply for material, and some bolts and drills, it went pretty easy. Strong enough to jack the truck up from under.
Good Luck!
[Edited by roadkill on 07-20-2000 at 08:01 AM]