I would sell the bumper and step up to one that is better suited for your needs. That basic bumper is not all it's cracked up to be. You can get a replacement for near same $$ as a quality reciever hitch. I'd get one with a reciever and d-ring shackle mounts at a minimum. I use my D-rings to attach my trailers safety chains. I also made extension chains, so if I haul someone else's trailer with shorter chains they will reach my D-rings.
This one will give you an idea f what to look for. You can buy the dring brackets and weld them to your current bumper too.
"If you don't stand behind our troops, Feel free to stand in front of them"
...There can be no divided allegiance here. Any man who says he is an American, but something else also, isn't an American at all. We have room for but one flag, the American flag... We have room for but one language here, and that is the English language... and we have room for but one sole loyalty and that is a loyalty to the American people.'
Theodore Roosevelt 1907