the OP does not mention TT brand
although most have very light weight bumpers
i suggest a hitch receiver get welded to the frame
and the cargo rack mounts to that, NOT the bumper
maybe arrange to raise the tire a little so it clears the rack
or rides on the rack with the other cargo ?
I can explain it to you.
But I Can Not understand it for you !
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1997 F53 Bounder 36s