I agree. Reducing the "bucking" is key and so the more rigid the entire system (receiver-hitch connection ("anti-rattle"), extension, rack AND bikes on the rack) the better.
We have a 1 OR 2 bike 1UpUsa rack that functions w/ either 1.25" or 2" receiver (to switch between vehicles or on back of TT), the weight of each bike is supported by the inflated bike tires-wheels and an additional unit for 3 bikes is possible.
These are rigidly built US made aluminum (nearly overkill)...check reviews, videos. I have a lot of confidence in putting several thousand $ of bike material (road, mtb, fat-bike) on ours (with a full time rear view camera to view traffic but also glance at the tops of the bikes).
