From All Pro's site.
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Bumper description:
"This bumper is mostly built from heavy-duty .120 wall, 1.75" and 1.5" diameter tubing with CNC laser cut and brake formed 3/16" plate steel for the winch structure and mounting plates. The sides wrap around the fenders and there's a bottom hoop that serves as protection for the low hanging radiator with an integrated steel skid plate."
Same diameter tubing as the TG bumper but no mention of using DOM. I don't know for sure what AP is using but I would think if it was DOM they would say so. Also the mounting to the frame is mostly at the same locations as the TG bumper but does not have a crossmember that spans the frame horns. Rather the mounting is tied together with the bumper tubing.
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This is the bumper mounting bracket on the AP bumper.
https://www.allprooffroad.com/images/stories/Tacoma/trailarmor/9504bumpers/front/95-04tacomafrontbumperJ-640.jpg[/img[
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From AP's site regarding their sliders:
[I]"The tubular structure is fabricated from heavy-duty 1.75" x .120" wall tubing sourced from US Steel Mills for industry-leading strength. The outer tube angles upward to provide more ground clearance and door protection. The rear of our Rock Sliders extend outward just before the rear wheels to provide extra body protection where it is needed most."[/I]
Again, same diameter and wall thickness tubing as the TG ones, but no mention of DOM. One differing feature is the kickout offered on the AP sliders.
Mounting plates are also welded to the frame but only on the outside of the frame, not across the bottom as well like the TG ones.
[img]https://www.allprooffroad.com/images/stories/Tacoma/TrailArmor/9504rockguards.jpg