A couple I have built for mine. Currently working on a third lol.
Both bumpers attach to factory threaded holes in the frame with 1/4” plate. All of the round tube you see is 1.75” .120 wall DOM and 1.5” .120 wall DOM tubing (round).
Everything is MIG welded with a Miller 211 using C25 gas and .030 Lincoln wire. I do own a tube bender which is a JD2 model 32 with an electric/hydraulic ram (super nice) as well as a Woodward fab tube notcher.
Other tools to note:
Milwaukee portaband with a Swag offroad table for cutting tube to length and cutting pieces of 1/4” plate, very nice since it’s not as loud as using a grinder with a cut off wheel.
4.5” angle grinder for clean up work or fine tuning tube notches.
Drills, dremel with various bits, milling machine for making big holes if needed.
Tape measure and calipers for measuring.
20 ton press with a Swag Offroad press brake for bending plate, full dimple die set too as my second bumper has 16 gauge steel dimpled plate on it.
I also own a Hypertherm power max 30 plasma cutter and Lincoln Square wave TIG welder but those weren’t used to make these bumpers.
I think this is the gist of it, probably close to 10k in tooling in my garage to be able to do this kind of stuff. That being said though, I didn’t always have all these nice tools. I started out with a $200 welder off Craigslist and a 4” angle grinder and I was making bumpers and sliders out of box tubing with just those. You could also make your own plate bumpers with a grinder and a welder.
I’m a big fan of CAD when building stuff, cardboard aided design. I’m not at a point where I have a 3D scanner to do legit CAD work on the computer but that’s just the next level up!