If you think an Ultra-lite bumper hitch receiver bike rack "works just fine;" have someone else drive while you follow in a car. That rack will move up and down almost a foot.
That rotation is transferred to the bumper and the welds that hold the bumper on will work harden over time and the bumper along with anything attached to it will "depart" without warning.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW