Same idea here:
https://www.swagman.net/product/swagman-x-mount-rack-storage/
https://www.amazon.com/Rack-Stash-Mounted-Storage-Organizer/dp/B00T2T2UT4
And more generic options:
https://www.amazon.com/s?k=bolt-on+receiver+tube&ref=nb_sb_noss_1
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