I just have screwed mine to a piece of angle iron that is bolted to the support for the rear bumper. I think all 3 campers we have owned had those tabs broken. I have either done like on the currect camper or just bolted directly to the rear bumper.
Mike - '73, DW - '78, DS - '04, DD - '08
2007 Jayco Jayflight 254 - 2003 Ford F-150