the SeaSucker model is one of the best and simplest bike racks I have ever seen. Thanks for sharingThe easiest with no modification, would be Seasucker racks. But, that still depends on the strength of the body.
https://www.seasucker.com/shop/hornet/
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https://www.seasucker.com/shop/1187/
Or one of the smallest quality folding bikes ever...Brompton
http://brompton.com