Go to a local well driller and ask for a length of used well casing. Trim it and blast it, weld up the ends with plate. Cut a twelve inch hole in the middle for a twelve in length of heavy duty 4 inch angle (scrap yard). Weld that in (that's your step). weld on some mounting plates to the frame and some military style tow rings and paint it your favorite color. Now you have a bumper that's round and will not catch on anything and is indestructible and next to free. Mine has seen three trucks and is still perfect. Every five years or so I paint it. Good luck.