A few beers, some tubing, a chop saw, and a welder and things just come together. I had a lot of square tubing left over from shipping crates so those bumpers was pretty cheap to make and why they are all out of square tubing. The 500 Rubicon D was pondering on a bumper so I took a picture of a machine and sketched one on it. Then I had to start building it... we use the bumpers a lot from pushing on each other to pushing trees out of the trail.